Download ABSORPTION LIQUID CHILLERS

MILLENNIUM TM CONTROL CENTER
OPERATIONS MANUAL
OPERATORS MANUAL
Supersedes: 155.16-O3 (894)
Form 155.16-O3 (797)
ABSORPTION LIQUID CHILLERS
28342A
MODELS YIA-ST-1A1 THROUGH YIA-ST-14F3 (STEAM)
MODELS YIA-HW-1A1 THROUGH YIA-HW-14F3 (HOT WATER)
FORM 155.16-O3
TABLE OF CONTENTS
Page
USING THIS BOOK ...............................................................................................
2
THEORY OF OPERATION
Overview ..................................................................................................
2
Operation ..................................................................................................
3
Dilution ......................................................................................................
9
Purge ........................................................................................................
10
OPERATION FLOW CHART .................................................................................
11
CONTROL CENTER .............................................................................................
88
OPERATION
Displaying System Parameters .................................................................
89
LiBr Concentration Calculator ...................................................................
91
System Setpoints ......................................................................................
91
Displaying System Setpoints ....................................................................
93
PROGRAMMING THE ISOFLOW CONTROL CENTER
Programming System Setpoints ...............................................................
94
SERVICE KEYS
Unit Keys ..................................................................................................
98
Other Service Keys ...................................................................................
99
OPERATING MODES ............................................................................................ 102
UNIT SWITCH ....................................................................................................... 103
DISPLAY MESSAGES ........................................................................................... 103
YORK INTERNATIONAL
1
USING THIS BOOK
The “Theory of Operation” section provides an overview
of the unit control provided by the MILLENNIUM CONTROL CENTER. Unit control is described and operating
and status messages that are displayed on the Control
Center display are highlighted.
The “Operation Flow Chart” can be used as a quick
reference of unit control providing safety, cycling and
warning messages and the inputs or thresholds that
produce these shutdowns and messages. Also, the
sequence of events of all safety and cycling shutdowns
and respective reset thresholds are detailed in separate flow charts. To use this flow chart, start at the
beginning and read down. The starting sequence is
described, followed by the system parameters that are
monitored (checked) by the Control Center. The Control Center’s response to each of these checks is described adjacent to the check. The Control Center is
programmed to respond in a certain way to each of the
monitored parameters. Pressures and temperatures
that exceed safety thresholds result in a safety shutdown. Other Control Center inputs that are open or
closed cause safety or cycling shutdowns. If a shutdown is initiated, the displayed message is shown. The
user is directed to a safety or cycling shutdown flowchart that details the sequence of events of the shutdown and allowable restart thresholds. That flowchart
then returns the user to the main flowchart. Not all
responses cause shutdowns. Some cause the Control
Center to limit operation by shutting down a pump or
inhibit unit loading. These responses are shown adja-
cent to the check along with any warning message.
The “Control Center” and “Operation” section describes
how to operate the Control Center. The functions of the
major grouping of keys are described. It also describes
how to display system parameters such as temperatures and pressures. Finally, each system setpoint is
explained along with how to display the programmed
system setpoints.
In the “Programming the Millennium Control Center” section, the operator is instructed in how to program system setpoints.
The “Service Keys” section describes the function and
operation of the service keys. The service keys are provided for use by the service technician or operator to
have manual control of certain unit functions.
The “Operating Modes” section describes the various
operating modes and how to change the operating
modes. The “Unit Switch” section describes how to start
and stop the unit.
The “Display Messages” section is a listing of all the
operating, status, safety and cycling shutdown messages that are displayed on the keypad display. The
meaning of each message is described in detail; including the system event threshold that caused the
message to be displayed and the event or threshold
that causes the message to be cleared.
THEORY OF OPERATION
OVERVIEW
An understanding of the operation of a single-stage
absorption chiller requires a review of the chiller’s micro panel wiring diagram, power panel wiring diagram,
the keypad, and the description which follows. Major
system components include the solution pump (replaced by two pumps – absorber and generator on 50
Hz Models YIA-10E3 – YIA-14F3 units equipped with
Franklin pumps – that are individually controlled); refrigerant pump; purge (vacuum) pump and purge solenoid
valve; manual purge valve; steam or hot water control
valve feedback potentiometer and steam or hot water
stop valve; generator shell pressure transducer, strong
solution temperature sensor, high pressure and high temperature cut-out switches; steam supply pressure transducer (steam units only); steam or hot water supply temperature sensor; automatic decrystallization (ADC)
temperature sensor; refrigerant temperature-sensor;
2
refrigerant temperature leaving the condenser sensor;
low refrigerant temperature cut-out switch; refrigerant
level float switch (1F); motor coolant level float switch
(2F) (units equipped with Franklin pumps only); refrigerant level float switch (3F) (units equipped with Buffalo
pumps only); chilled and condenser water flow switches
(condenser water flow switch furnished by others); chilled
and condenser water pumps (by others); inlet and outlet
temperature sensors for chilled and condenser water circuits; refrigerant (unloader) solenoid valve; stabilizer refrigerant solenoid valve; motor coolant solenoid valve
(units equipped with Franklin pumps only); and steam
condensate drain solenoid valve.
An absorption chiller functions by heating a lithium bromide solution to generate hot refrigerant vapor and
strong solution (64.5% lithium bromide).
YORK INTERNATIONAL
FORM 155.16-O3
Two variations of the Model YIA units are as follows:
• Models YIA-ST-1A1 thru YIA-ST-14F3 with ADC for
steam applications.
• Models YIA-HW-1A1 thru YIA-ST-14F3 with ADC for
hot water applications.
Although two applications exist for Models YIA steam
and hot water units; namely, standard and FAX-4500
versions, both are accomplished through the use of a
single EPROM. FAX-4500 operation is selected by placing the EMS/MODEM Micro Board jumper in the EMS
position and selecting REMOTE mode from the keypad.
Standard operation is selected by placing the EMS/
MODEM Micro Board jumper in the MODEM position
and selecting LOCAL mode from the keypad. Remote
hard-wired PULSE WIDTH MODULATION (PWM) operation may also be selected by placing the MODEM/
EMS Micro Board jumper in the MODEM position and
selecting REMOTE mode from the keypad.
Units could be equipped with either of two pump types,
depending upon the unit vintage. Units manufactured
before June 1996 are equipped with Franklin pumps*.
After that, units are equipped with Buffalo pumps.
EPROM version A.02F.02 (and later) support both types
of pumps. Micro Board program jumper JP2 selects the
appropriate control for either pump type: IN – Buffalo
pumps, OUT – Franklin pumps.
Units equipped with Franklin pumps have a Refrigerant
Level Float Switch (1F), a Motor Coolant Float Switch
(2F) and a Motor Coolant Solenoid Valve (1SOL). Also,
on 50 Hz Models YIA-10E3 thru YIA-14F3 with Franklin
pumps, the Solution pump is referred to as the Absorber
pump; and there is an additional pump called the Generator pump (4M). Operation is as described below in
“Operation” section.
If the unit is equipped with Buffalo pumps, the Refrigerant pump must be controlled differently than if the unit is
equipped with Franklin pumps. The Buffalo Refrigerant
pump must not be allowed to run for extended periods
without pumping refrigerant because it is cooled with
refrigerant. Refrigerant Level Float Switches (1F) and
(3F) are used to detect the refrigerant level at the pump
input. Float switch 1F is located above 3F. The pump will
not be started until the refrigerant level is sufficient to
cause both 3F and 1F to close. When the level has decreased to a level that causes both 1F and 3F to open,
the pump will be shut off. There are certain programmable setpoint time delays associated with these events;
“REFRIGERANT PUMP START-UP DELAY” timer determines the time delay between detection of sufficient
refrigerant level and refrigerant pump start; “REFRIGERANT PUMP SHUTDOWN DELAY” timer determines
the time delay between detection of insufficient refrigerant level and refrigerant pump shutdown; and REFRIGYORK INTERNATIONAL
ERANT FLOAT SWITCH SHUTDOWN” timer determines
the number of minutes the unit is permitted to run without the refrigerant pump running. If this time is exceeded,
a safety shutdown is performed. These setpoints can be
changed only by a qualified service technician following
instructions in “Service” manual, Form 155.16-M3. The
Motor Coolant Float Switch (2F), Motor Coolant Solenoid Valve (1SOL), and Generator Pump (4M) (50 Hz
Models YIA-10E3 thru YIA-14F3) required for Franklin
pumps are not present. The Solution pump is not called
the Absorber pump on 50 Hz models as with units
equipped with Franklin pumps. Also, the Automatic
Decrystallization Cycle (ADC) is performed differently
than with Franklin pumps. Operation is described below
in “Operation” section.
OPERATION
Whenever power is applied to the micro panel, the following safety checks are performed: generator shell high
pressure and high temperature (analog and digital) cutouts; steam supply pressure (safety and warning checks;
steam units only); low refrigerant temperature (analog
and digital) cut-outs; steam or hot water supply temperature (safety and warning checks); refrigerant temperature sensor; motor coolant level float switch (units
equipped with Franklin pumps only); solution (absorber
on 50 Hz Models YIA-10E3 – YIA-14F3 with Franklin
pumps), generator (50 Hz Models YIA-10E3 – YIA-14F3
with Franklin pumps) and refrigerant pump overloads and
thermal switches; all standard customer interface contacts; if tripped, they produce a “SYSTEM SHUTDOWN
PRESS STATUS” message with the appropriate status
message. Both the refrigerant level float switch and the
automatic decrystallization temperature sensor are monitored whenever power is applied to perform control functions. A 10 second lockout delay at power-up prevents
pump chattering if the supply power is intermittent. The
steam or hot water control valve potentiometer, when
open above 10%, prevents unit start by providing a unit
cycling shutdown. Whenever power is applied, the status of the purge pump motor overloads are checked and,
if tripped, produce a background message “WARNING:
PURGE PUMP OVERLOADS OPEN”.
The steam condensate drain solenoid valve (steam units
only) prevents steam flow through the generator whenever the unit is off or whenever a power failure occurs.
This reduces the possibility of unit crystallization. Similarly, on hot water applications, the unit’s installer must
ensure that the hot water pump does not operate during
unit power failures.
Manual operation of the solution (absorber on 50 Hz
Models YIA-10E33 – YIA-14F3 with Franklin pumps)
pump; generator pump (50 Hz Models YIA-10E3 – YIA14F3 with Franklin pumps); refrigerant pump; purge
pump; chilled water pump, condenser water pump, and
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manual dilution cycle is controlled via the MANUAL
PUMP key in the Service section of the keypad. The
PUMP STATUS key employs a scrolling feature to allow
control of the pumps, the manual dilution cycle, and the
stabilizer refrigerant solenoid valve via the MANUAL
PUMP key. In SERVICE mode, each pump may be operated manually if not already required to run due to
chiller operation or the dilution cycle; in addition, if the
refrigerant temperature is below 34°F (1.1°C), the solution pump does not allow manual operation; if a respective pump’s overloads trip, the manual run signal is terminated. Units equipped with Franklin pumps do not allow manual operation of the refrigerant, solution or generator pumps while the motor coolant float switch (2F) is
open, and units equipped with Buffalo pumps do not allow manual refrigerant pump operation unless both refrigerant level float switches (1F) and (3F) are closed.
The pump shall be on for 2 hours (except the purge pump,
which requires manual turnoff) and then automatically
turn off. While the PUMP STATUS key is used to display
the message “MANUAL DILUTION CYCLE”, the MANUAL PUMP key (in SERVICE mode only) allows on/off
operation of the manual dilution cycle; with the unit off
and not in the automatic dilution cycle, it initiates a dilution cycle unless the refrigerant level float switch is open
or the refrigerant temperature is less than or equal to
34°F (1.1°C). When activated, the solution (absorber
and generator on 50 Hz Models YIA-10E3 – YIA-14F3
with Franklin pumps), refrigerant, chilled and condenser
pumps run until the refrigerant level float switch opens,
the refrigerant temperature falls to 34°F (1.1°C), or 6
minutes has elapsed. To stop the manual dilution cycle
before automatic termination, press the MANUAL PUMP
key again. The stabilizer refrigerant solenoid valve may
be controlled manually in SERVICE mode only via the
MANUAL PUMP key when the PUMP STATUS key is
used to display the “STABILIZER REFRIGERANT SOLENOID VALVE ON (OFF)” message and MANUAL
operation has been selected using the MANUAL PUMPS
key via the special access code in PROGRAM mode.
The on/off status for all pumps and solenoids is provided on the unit print-out. In LOCAL, REMOTE, or SERVICE mode, the MANUAL PUMP key is used in conjunction with the PUMP STATUS key to control operation of the PURGE PUMP to allow manual purge operation.
To initiate a start in LOCAL mode, press the UNIT switch
on the keypad. If the steam or hot water control valve is
open less than 10% and the leaving chilled water temperature is at or above setpoint, the panel displays the
message “COOLING START SEQUENCE INITIATED”
and the chilled water pump contacts close. The chilled
water and condenser flow switches are bypassed for 30
seconds each after the respective pump is turned on, or
until the respective flow switch closes, if less than 30
seconds. If the unit is kept from starting because the
leaving water temperature is below setpoint, a cycling
4
shutdown shall be initiated, with the background message “WED 2:34PM LVG WATER TEMP BELOW SETPOINT”. For LWT shutdowns only, the system starting
temperature is determined by adding 2.0°F(1.1°C) to the
leaving chilled water setpoint. Similarly, the LWT cycling
shutdown occurs when the temperature falls to 2.0°F
(1.1°C) below setpoint or a minimum of 38°F (3.3°C);
when this occurs, the dilution cycle is initiated; following
this, the chilled water pump continues to run, unless the
UNIT switch is placed in STOP/RESET position. If one
or more of the system status checks is negative, the
panel displays the “SYSTEM SHUTDOWN-PRESS STATUS” message with the appropriate background message. If all checks are normal, the chilled water pump
starts immediately. When the chilled water flow switch
closes, the condenser pump is turned on.
If the condenser water flow switch does not close within
30 seconds of the condenser pump turn-on, a cycling
shutdown is performed. When the condenser flow switch
closes, the steam/hot water shutoff valves are energized
and if the unit is equipped with Franklin pumps, the refrigerant pump and generator pump (50 Hz Models YIA10E3 - YIA-14F3) are started. Simultaneously, the panel
displays “SYSTEM RUN-LVG CHILLED WATER CONTROL”.
If the unit is equipped with Buffalo pumps, refrigerant
pump operation is controlled by float switches 1F and
3F. The refrigerant pump is not started until both refrigerant level float switches 3F and 1F close and the “REFRIGERANT PUMP STARTUP DELAY” setpoint timer
has elapsed as follows: The refrigerant level will rise to a
level that causes 3F to close. As the level continues to
rise, it will cause 1F to close. When 1F closes, the REFRIGERANT PUMP STARTUP DELAY setpoint timer
(1-900 seconds) is started. If 1F remains closed for the
duration of the timer, the refrigerant pump is started when
the programmed delay has elapsed. After the refrigerant pump has been started, if the refrigerant level decreases to the extent that first 1F opens and then 3F
opens, the REFRIGERANT PUMP SHUTDOWN DELAY setpoint timer (1-45 seconds) is started when 3F
opens. If 3F remains open for the duration of the timer,
the refrigerant pump is shut off after the programmed
delay has elapsed. When the unit first enters SYSTEM
RUN or after a refrigerant pump shutdown has occurred
due to low refrigerant level, the REFRIGERANT FLOAT
SWITCH SHUTDOWN setpoint timer (20-60 minutes)
is started. The programmed value is the number of minutes the unit is allowed to run without the refrigerant pump
running. If the refrigerant pump is not started before the
timer has elapsed, a safety shutdown is initiated and
“DAY-TIME-REFRIGERANT PUMP FLOAT SW FAILURE” is displayed. To assure that both 1F and 3F float
switches are operational and not stuck in one position,
the program compares the state of 1F to 3F. Since each
float switch closes as the refrigerant level rises against
YORK INTERNATIONAL
FORM 155.16-O3
it and opens when the level decreases below the float,
and 1F is at a higher level than 3F, it is not possible that
1F would be closed if 3F is still open; unless one of the
switches is stuck in one position. If this condition is detected, a safety shutdown is performed and “DAY-TIMEREF PUMP FLOAT SW CONFLICT” is displayed. NOTE:
the state of each float switch is not recognized as being
valid until it has been in the same position for the duration of the respective float switch timer. 1F is determined
by REFRIGERANT PUMP STARTUP DELAY setpoint
timer; 3F is determined by REFRIGERANT PUMP
SHUTDOWN DELAY setpoint timer. Therefore, the float
switch conflict will be allowed to exist for the duration of
the respective timer, depending upon which float switch
is causing the conflict.
The refrigerant level solenoid (unloader control) valve is
energized (open) whenever the refrigerant level float
switch opens and the leaving water temperature is less
than 5°F (2.8°C) above setpoint. If the refrigerant temperature is above 34.0°F (1.1°C), the solution (absorber
on 50 Hz Models YIA-10E3 – YIA-14F3 with Franklin
pumps) pump is also turned on. If however, the refrigerant temperature falls below 34.0°F (1.1°C), the solution
(absorber on 50 Hz Models YIA-10E3 – YIA-14F3 with
Franklin pumps) pump is turned off and will not turn on
until the refrigerant temperature has risen above 35.5°F
(1.9°C). If the refrigerant temperature is above 36.0°F
(2.2°C), the stabilizer refrigerant solenoid valve is deenergized (closed). Coincidental with the opening of the
steam or hot water stop valve, if selected by the operator, a software timer is initiated, limiting the steam or hot
water control valve actuator opening, delaying the automatic temperature-controlled operation of the actuator.
This function prevents excessive steam or hot water use
during unit pulldown, allowing the unit to ramp up to match
the load over an adjustable 0 to 255 minute interval. This
feature is called the Pulldown Demand Limiter. At the
conclusion of the pulldown interval or whatever the
pulldown limit is not exceeded, unit loading is controlled
by the automatic temperature control algorithm.
The minimum position of the modulating steam or hot
water valve is programmable from 10-20% valve position. The micro panel varies the load by pulsing the steam
or hot water control valve actuator close and open to
control chiller capacity from the programmed lower limit
(10 - 20%) to 100%. At unit shutdown, the steam or hot
water control valve is driven closed. A potentiometer on
the valve provides position feedback to the micro panel,
which is displayed on the keypad via the DISPLAY DATA
key. System start is only allowed when the steam or hot
water control valve is unloaded below 10%. Steam or
hot water units are used for cooling only. All units can be
manually controlled (LOAD, UNLOAD, HOLD) in SERVICE mode from the keypad. When a unit is commissioned, it is sometimes necessary to limit the maximum
load. This is accomplished by entering the special acYORK INTERNATIONAL
cess code to enter PROGRAM mode. Via the LOAD key,
the Service Engineer can program the MAXIMUM
COOLING LOAD and from 50 to 100%. The default value
is 100%. When the unit is operating, if the maximum load
is reached, the message displayed is “SYSTEM RUN MAXIMUM COOLING”.
During operation, the refrigerant temperature sensor,
which is continuously monitored and displayed, provides
several control functions. If the refrigerant temperature
falls to 35.5°F (1.9°C), the stabilizer refrigerant solenoid
valve (2SOL) is energized (open) on units equipped with
Franklin pumps; if the unit is equipped with Buffalo pumps,
it will be energized only if the refrigerant pump is running. This transfers refrigerant to the generator’s solution outlet line to reduce the concentration, thus reducing the cooling capacity of the unit. This lessens the possibility of crystallization. Simultaneously, the warning
message “LOW REFRIGERANT TEMPERATURE” is
displayed via the STATUS key and unit loading is inhibited. If the temperature falls to 34.0°F (1.1°C), the solution (absorber on 50 Hz Models YIA-10E3 – YIA-14F3
with Franklin pumps) pump turns off; this should allow
the refrigerant temperature to rise. If the refrigerant temperature rises to 35.5°F (1.9°C), the solution pump turns
on. If the refrigerant temperature rises to 36.0°F (2.2°C),
the stabilizer refrigerant solenoid valve is de-energized
(closed), and the unit loading inhibit is removed. However if the refrigerant temperature continues to fall, a
low refrigerant temperature safety shutdown occurs at
33.0°F (.5°C). If the unit experiences a shutdown when
the refrigerant temperature is 34°F (1.1°C) or below, the
chilled water pump continues to run for a minimum of 30
minutes. Subsequently, when the refrigerant temperature rises to 37.0°F (2.8°C), the dilution cycle begins.
The motor coolant solenoid valve (units with Franklin
pumps only) is energized (open) whenever the strong
solution temperature is above 160°F (71.1°C) (on units
equipped with EPROM version A.02F.02 or later, this
threshold is programmable from 127°F to 160°F (52.8 to
71.1°C); the threshold should only be programmed by a
qualified service technician following instructions in “Service” manual, Form 155.16-M3). The solenoid is de-energized (closed) whenever the strong solution temperature is below 150°F (65.6°C) (on units equipped with
EPROM version A.02F.02 or later, the close threshold is
equal to the programmed open threshold minus 10°F).
The purpose of the valve is to prevent evaporation of
water from the float chamber during unit shutdown or
when the unit operates at low load and low condensing
water temperatures. However, if the refrigerant and solution (absorber and generator on 50 Hz Models YIA10E3 – YIA-14F3 with Franklin pumps) pump motor coolant level float switch opens, the unit locks out on a safety
shutdown.
A feature limits the steam or hot water control valve open5
ing to 30% whenever the generator shell pressure threshold of 10.00 PSIA is reached. During this time, the panel
displays the message “SYSTEM RUN-PRESS STATUS”
and the warning relay contacts are closed. The STATUS
key displays the warning message “HIGH PRESSURE
OVERRIDE”. This feature allows the chilled water temperature control to be bypassed in order to keep the unit
from cycling off. The warning relay contacts open when
the WARNING RESET key is pressed in LOCAL, REMOTE or SERVICE mode; the message clears only if
the pressure falls to 6.00 PSIA (41.4 kPa) and subsequently the WARNING RESET key is depressed in SERVICE mode. If the generator shell pressure continues to
rise, however, the unit shall perform a safety via the HP
cut-out switch at the preset value and, display the message “SYSTEM SHUTDOWN-DILUTION-PRESS STATUS”. The background message shall read “DAY-TIME
GEN SHELL HIGH PRESS-DIG”. An analog backup cutout has also been put in place should the HP cut-out
switch fail. If the switch should fail, the analog HP cutout (triggered at generator shell pressure >15.00 PSIA
(103.4 kPa)) would cause the unit to perform a safety
shutdown and dilution cycle. The background message
shall read “DAY-TIME GEN SHELL HIGH PRESS-ANA”.
Whenever the unit shuts down, the steam or hot water
control valve and steam or hot water water stop valve are
de-energized. After completion of the dilution cycle, the
message shall read “SYSTEM SHUTDOWN-PRESS
STATUS”. When the pressure falls to the reset value,
with all other safety and cycling checks satisfied, the
chiller can be manually restarted after pressing the UNIT
switch to STOP/RESET.
When the ADC temperature rises to 160°F (71.1°C), the
steam or hot water flow to the unit is reduced to 50% for
a minimum of 10 minutes. Simultaneously, the stabilizer
refrigerant valve is energized for two minutes, transferring refrigerant to the generator’s drain line and thus to
the shell side of the heat exchanger to dilute the solution; during the 10 minute cycle, the displayed message
is “SYSTEM RUN-AUTOMATIC DECRYSTALLIZATION”.
After 10 minutes, if the ADC temperature falls to 150°F
(65.6°C), the cycle terminates; otherwise, the cycle repeats itself. It must be noted that the ADC operation will
continue for at least 10 minutes regardless of a shutdown or subsequent restart. Manual operation of the stabilizer refrigerant solenoid valve may be selected by using the MANUAL PUMP key in PROGRAM mode via
the special access code. When selected, manual operation of the stabilizer solenoid valve is controlled in SERVICE mode using the MANUAL PUMPS key. The ADC
temperature is displayed via the DISPLAY DATA key.
On units equipped with Buffalo pumps, if the refrigerant
pump is not running (due to low refrigerant level) when
an AUTOMATIC DECRYSTALLIZATION CYCLE (ADC)
is initiated or if the pump is turned off during an ADC
(due to low refrigerant level), The normal ADC is not
6
performed. Instead, a “LIMITED ADC” is performed. The
limited ADC has two phases; PRIMARY and SECONDARY. The PRIMARY LIMITED ADC is the same as a
normal ADC except it is performed for 10 minutes only
and the STABILIZER REFRIGERANT SOLENOID
VALVE (2SOL) is not energized (opened) during the first
two minutes of the cycle, as would be done in a normal
ADC. If a Primary ADC is initiated during a normal ADC,
it will be performed for the time remaining on the normal
ADC timer. “SYSTEM RUN-PRIMARY LIMITED AUTODECRYST” is displayed. If refrigerant level float switches
1F and 3F close to start the refrigerant pump before the
PRIMARY limited ADC terminates, a normal ADC is
performed for the time remaining on the 10 minute primary limited ADC timer (the Stabilizer Refrigerant Solenoid Valve 2SOL is energized for the first 2 minutes of
the of the remaining time). Otherwise, when 10 minutes
have elapsed and the PRIMARY LIMITED ADC terminates, normal chiller operation continues, unless the ADC
temperature (RT2) is > 150°F (65.6°C) when it terminates, then the SECONDARY LIMITED ADC is initiated.
The SECONDARY LIMITED ADC is performed for 15
minutes. While it is in effect, the Stabilizer Refrigerant
Solenoid Valve (2SOL) is not energized (opened) and
steam/hot water valve is driven to the closed (0%) position. “SYSTEM RUN-SECONDARY LMTD AUTODECRYST” is displayed. If refrigerant level float switches
1F and 3F close to start the refrigerant pump before the
SECONDARY limited ADC terminates, a NORMAL ADC
is performed (up to maximum of 10 minutes) for the time
remaining on the 15 minute secondary limited ADC timer
(the Stabilizer Refrigerant Solenoid Valve 2SOL is energized for the first 2 minutes of the remaining time) and
the unit continues to run. Otherwise, a safety shutdown
is performed and “DAY-TIME-RFS-CHK FOR CRYSTALIZATION” is displayed. (RFS = Refrigerant Float
Switch.)
If the refrigerant level float switch opens and the leaving
chilled water temperature is less than 5°F (2.8°C) above
setpoint, the refrigerant level solenoid (unloader control)
valve is energized (open) to transfer solution from the
solution (absorber on 50 Hz Models YIA-10E3 – YIA14F3 with Franklin pumps) pump discharge to the refrigerant pump suction when a low level of refrigerant
would otherwise cause refrigerant pump cavitation. This
occurs at light loads with low condenser water temperatures. The refrigerant level solenoid valve is inhibited from
opening whenever the leaving chilled water temperature
is greater than or equal to 5°F (2.8°C) above setpoint.
The status of the refrigerant level float switch (open or
closed) and the panel’s control signal to the refrigerant
level solenoid (unloader control) (open or closed) is displayed via the DISPLAY DATA key. Manual operation of
the unloader control solenoid may be accomplished in
SERVICE mode via the special access code using the
DISPLAY DATA key in PROGRAM mode. Note that
YORK INTERNATIONAL
FORM 155.16-O3
manual operation of the refrigerant level solenoid is only
allowed in MANUAL PUMPS key via the special access
code in the PROGRAM MODE. If the refrigerant level
solenoid is manually energized (open), it is de-energized
(closed) as follows:
• Manually, using the DISPLAY DATA key
• Automatically, if the mode is changed for SERVICE to
LOCAL or REMOTE
Whenever the refrigerant level float switch is open, the
dilution cycle is inhibited or terminated.
Whenever the panel is placed in MANUAL SOLENOID
OPERATION in SERVICE mode through the use of the
MANUAL PUMPS key via the special access code in
PROGRAM mode, both the refrigerant solenoid valve
and the stabilizer refrigerant solenoid valve fall under
manual control. With the exception of the automatic
decrystallization routine, neither pump will respond to
any automatic control while manual control is active. If
the automatic decrystallization routine become active,
the refrigerant stabilizer solenoid valve is reverted from
manual control back to automatic control for as long as
the decrystallization, routine is active. At the end of the
automatic decrystallization, the refrigerant stabilizer solenoid, if previously in MANUAL mode, will once again
fall under manual operation. When automatic solenoid
operation is selected using the same procedure described above, manual control of the refrigerant level
solenoid valve is inhibited and only automatic controls
will affect the operation of the valves. Upon exit form
SERVICE mode, if the valves are in MANUAL OPERATION mode, they will automatically switch to automatic
solenoid control operation.
When the unit is running, there are two different features designed to prevent crystallization; if unit is
equipped with EPROM version A.02F.00, the STRONG
SOLUTION TEMP CONTROL is used. If the unit is
equipped with EPROM version A.02F.01 or later, this is
replaced by “LOW ENTERING CONDENSER WATER
TEMP LOAD LIMIT”.
When the unit is equipped with EPROM version A.02F.00,
three temperatures are monitored to perform STRONG
SOLUTION TEMP CONTROL as follows:
• Refrigerant Temperature Leaving the Condenser
(RTLC)
• Strong Solution Temperature
• Leaving Chilled Water Temperature (LCWT)
The first two sensor temperatures are displayed via the
REFRIGERANT / SOL’N TEMPS keys using a scrolling
technique. Whenever the RTLC is between 72°F and
117°F (22.2°C and 47.2°C), the strong solution temperature shall not exceed the values listed following:
YORK INTERNATIONAL
Maximum Refrigerant
(°F) 72
Temperature Leaving
the Condenser (RTLC) (°C) 22.2
97
36.1
Strong Solution
Temperature
205
96.1
(°F) 170
(°C) 76.7
104
40
117
47.2
214
231
101.1 110.6
For RTLC values between 72°F and 117°F (22.2°C and
47.2°C), but not listed in the table, the corresponding
maximum strong solution temperature is interpolated. If
the strong solution temperature exceeds the allowable
limit, steam or hot water control valve loading is inhibited and the RTLC/strong solution temperature algorithm
is enabled to slowly pulse the valve closed (based on
the table below) until the strong solution temperature is
less than or equal to the limit. However, if the leaving
chilled water temperature is less than or equal to the
setpoint, the steam or hot water control valve is closed
in accordance with the LCWT automatic temperature
control algorithm. Whenever the RTLC limits loading, the
displayed message is “SYSTEM RUN - STRONG SOLUTION TEMP CONTROL”. When the RTLC limits loading, if subsequently the RTLC check determines that the
specified temperature is 1.0°F (.6°C) below the maximum, the message is replaced with “SYSTEM RUN LVG CHILLED WATER CONTROL”, and the automatic
temperature control algorithm is in effect.
VALVE
TYPE
PULSE
DURATION
INTERVAL
BETWEEN PULSES
BUTTERFLY
1 second
15 seconds
CAGE/GLOBE
2 seconds
60 seconds
If the unit is equipped with EPROM version A.02F.01,
the STRONG SOLUTION TEMP CONTROL is replaced
by LOW ENTERING CONDENSER WATER TEMP
LOAD LIMIT. After a 30 minute bypass at unit start, whenever the entering condenser water temperature is < 74°F
(23.2°C), the maximum allowed steam/hot water valve
position is determined by the valve profile. This profile
includes the valve size, flow characteristics and linearity. These parameters are stored in memory and accessed based on the YORK part number of the value
used on the unit. This part number is entered by a qualified serviced technician using a procedure in the “Service” manual, Form 155.16-M3. While the loading is being limited due to this condition, “SYSTEM RUN - LOW
ECDWT LIMIT IN EFFECT” is displayed. Units equipped
with EPROM version A.02F.02 and later, in addition to
requiring the entering condenser water temperature to
be <74°F (23.2°C), also require the strong solution temperature to be > the LOW ECDWT SOLUTION TEMP
OVERRIDE setpoint to perform this load limit. This
setpoint is entered by a qualified service technician using a procedure in “Service” manual, Form 155.16-M3.
An upper limit on entering condenser water tempera7
ture provides a warning message and limits the maximum load to 60% of the steam or hot water valve position. The feature, which is bypassed for the first 30 minutes of unit operation, is in effect when the entering condenser water temperature exceeds the specified limit
for 10 minutes continuously. The maximum allowable
entering condenser water temperature for full load operation is programmable from 75°F to 125°F (23.9°C to
51.7°C). To program the value, the Service Engineer must
enter the special access code and then PROGRAM
mode. Press the COND WATER TEMPS key and enter
the desired maximum entering condenser water temperature for which 100% load is allowable. The default
value is 86°F (30°C).
Pull down demand limiting is a standard feature for all
units. In PROGRAM mode, this function allows selection of the duration of the demand limit interval, the starting maximum steam or hot water valve position signal,
and the ending maximum steam or hot water valve position signal. The programmable range is from 20 to 100%
for steam or hot water units; the allowable duration is
from 0 to 255 minutes. Operation of this function is as
follows: Each time the unit starts, a timer begins counting down the pull down interval. Unit loading/unloading,
controlled by the automatic temperature control algorithm, is initially limited by the maximum programmed
start value. For the remainder of the interval, the limit is
the value determined by the difference between the starting and ending values multiplied by the time since starting divided by the total time interval selected. Thus, the
actual limit linearly increases from start to end, allowing
the unit to ramp load to limit steam or hot water input.
During the pull down interval, pressing the PULL DOWN
DEMAND key displays the actual load limit and the time
remaining until timeout.
All steam/hot water valve loading limits (strong solution
temp control, low entering condenser water temp limit,
automatic decrystallization limit, pulldown limit, remote
load limit, maximum load limit), when active, will automatically be scrolled on the display one after another
should two or more be in effect simultaneously. For example, if the automatic decrystallization limiting is in effect and the steam / hot water valve is above the pulldown
limit, the display will flash between the following two
messages so long as the two limits are in effect: SYSTEM RUN-AUTOMATIC DECRYSTALLIZATION, and
SYSTEM RUN-PULL DOWN LIMIT.
Units with YORK’s optional Integrated Systems Network
allow remote start/stop, remote reset of leaving chilled
temperature, and remote steam or hot water limiting. In
addition, all unit information that is displayed on the micro panel is transmitted to the FAX. Whenever the remote load limit function inhibits the automatic temperature control operation, the message “SYSTEM RUN-
8
LEAVING CHILLED WATER CONTROL” is replaced with
the message “SYSTEM RUN REMOTE LOAD LIMIT”.
Unit installations where it is desired to communicate with
an existing building automation system or a DDC controller can be accommodated by employing the Translator.
Steam and hot water units have a feature which allows a
remote hard-wired input signal on relay board terminals
82 and 1 to provide a remote steam or hot water limit
function. The standard signal accepted by the panel is a
1-11 second PWM signal which allows the limit to be set
from the programmable lower valve limit of 10 - 20% to
100% of the steam or hot water valve position. With the
optional card file and reset card, the signal can be 420mA, 0-10VDC, or a discrete contact closure. If the
remote steam or hot water limit function inhibits the automatic leaving chilled water temperature control algorithm, the message “SYSTEM RUN-LEAVING CHILLED
WATER CONTROL” is replaced with “SYSTEM RUNREMOTE LOAD LIMIT”.
When the HISTORY PRINT key is pressed without a
printer connected to the panel the last four causes of
safety or cycling shutdowns and the date and time of
each are scrolled in a last in, first out format. Upon pressing the HISTORY PRINT key, each shutdown message
may be scrolled manually via the ADVANCE DAY/
SCROLL key. Pressing the ADVANCE DAY/SCROLL
key repeatedly or any other Display key (including the
CANCEL key) exits the HISTORY display. The standard
print-out also includes this information.
The absorption chiller can display and print messages
in either English or German. Jumper J12 on the I/O Expansion Board determines which language is displayed
and printed. If J12 is installed, English messages will
appear, otherwise if J12 is removed, German messages
will be active.
The software is also equipped with a concentration calculator routine. This routine allows a serviceman to determine what the concentration level of the solution is at
any time. Access to the calculator routine is gained by
pressing the OPTIONS key in PROGRAM mode.
If the unit is equipped with EPROM version A.02F.02 (or
later), the solution concentration is automatically calculated using the strong solution temperature (as sensed
by thermistor RT3) and the refrigerant temperature leaving the condenser (as sensed by thermistor RT9). Concentrations between 40% and 70% will be displayed.
Concentrations outside of this range will be displayed
as “> 70%” or “< 40%”. The solution concentration is
displayed as one of the scrolled messages using the
REFRIGERANT/SOLUTION TEMPS key.
YORK INTERNATIONAL
FORM 155.16-O3
DILUTION
The dilution cycle occurs at most shutdowns. The dilution cycle is required to prevent crystallization of the
lithium bromide solution. During the dilution cycle, the
solution (absorber and generator on 50 Hz Models YIA10E3 – YIA-14F3 with Franklin pumps); refrigerant; and
chilled and condenser water pumps are on and a 6
minute timer is initialized. Normally, the dilution cycle
terminates via the 6 minute timer. However, if the refrigerant level float switch is open, the dilution cycle
is terminated immediately; if the refrigerant temperature is less than or equal to 34°F (1.1°C), the dilution
cycle is terminated. If the chiller is shut down due to
the solution (absorber or generator on 50 Hz Models YIA-10E3 – YIA-14F3 with Franklin pumps) or refrigerant pump overloads or thermal switches, the
condenser water flow switch, the refrigerant temperature sensor or cut-out switch, the chilled water
flow switch, or the motor coolant level float switch,
the dilution cycle shall be by-passed. Opening of any
of the previously listed contacts (in bold type) during the dilution cycle also disables the dilution cycle.
If the solution (absorber or generator on 50 Hz Models
YIA-10E3 – YIA-14S with Franklin pumps) or refrigerant
thermal switches reclose, the dilution cycle is initiated
(one time only) if the strong solution temperature is above
136°F (57.8°C). However, if the strong solution temperature falls to <136°F (57.8°C) and the dilution cycle has
not begun, or if the overload contacts close a second
time, the unit shall initiate a safety shutdown with the
background message “TUE 9:47AM-PO-CHK FOR
CRYSTALLIZATION”. After decrystallization, if necessary, the unit can be restarted by depressing the WARNING RESET key in SERVICE mode. Either a power failure, unit start, or “CHK FOR CRYSTALLIZATION” message clears the dilution cycle counter.
If the condenser water flow switch is open for at least 30
seconds while the system is running or during a dilution
cycle, the unit will shut down on a condenser water flow
switch failure. If the UNIT switch is in RUN position, the
start sequence is initiated if the switch recloses and the
strong solution temperature is above 136°F (57.8°C); if
the UNIT switch is in STOP/RESET position, the dilution
cycle is initiated. If the strong solution temperature falls
to <136°F (57.8°C), however and the condenser water
flow switch is open, the unit shall initiate a safety shutdown with the background message “TUE 9:47AM
CDFL-CHK FOR CRYSTALLIZATION”. After decrystallization, if necessary, the unit can be restarted by depressing the WARNING RESET key in SERVICE mode.
If the unit is shut down due to the low refrigerant temperature cut-out at 33.0°F (.5°C) (provided by the low
refrigerant temperature switch or sensor), the chilled water pump shall continue to run for a minimum of 30 min-
YORK INTERNATIONAL
utes. The dilution cycle shall be initiated if the refrigerant
temperature rises to 37.0°F (2.8°C) and the strong solution temperature is above 136°F (57.8°C). If the strong
solution temperature falls to <136°F (57.8°C), and the
dilution cycle has not begun, the unit shall initiate a safety
shutdown; the background message shall be “WED
2:34PM-LRT-CHK FOR CRYSTALLIZATION”. After
decrystallization, if necessary, the unit can be restarted
by depressing the WARNING RESET key in SERVICE
mode.
Following a chilled water flow switch failure and subsequent unit safety shutdown, the chilled water pump continues to run for a minimum of 30 minutes. If the chilled
water flow switch recloses while the strong solution temperature is above 136°F (57.8°C), the dilution cycle shall
begin. If however, the strong solution temperature falls
to <136°F (57.8°C) with the chilled water flow switch
open, the dilution cycle is bypassed and the background
message is “WED 2:34PM-FLS-CHK FOR CRYSTALLIZATION”. After decrystallization, if necessary, the unit
can be restarted by depressing the WARNING RESET
key in SERVICE mode.
Following a power failure, if the unit had not previously
completed the dilution cycle and the strong solution temperature is above 136°F (57.8°C) and the unit is configured for manual restart after power failure (via removal
of Micro Board jumper J50), the unit shall begin the dilution cycle. However, if the strong solution temperature
falls to <136°F (57.8°C), and the dilution cycle has not
begun, the unit shall initiate a safety shutdown in which
the background message is “WED 2:34PM-PF-CHK
FOR CRYSTALLIZATION”. After decrystallization, if necessary, the unit can be restarted by depressing the
WARNING RESET key in SERVICE mode. If the unit is
configured for auto restart after power failure (via insertion of Micro Board jumper J50), the dilution cycle shall
be bypassed and a system start will occur.
If the unit is equipped with EPROM version A.02F.00,
following a motor coolant float switch safety shutdown, if
the float switch recloses while the strong solution temperature is above 136°F (57.8°C), the unit shall begin
the dilution cycle. However, if the strong solution temperature falls to <136°F (57.8°C) before the switch
recloses, the unit shall initiate a safety shutdown with
the background message “WED 2:34PM-MCFL-CHK
FOR CRYSTALLIZATION”. After decrystallization, if necessary, the unit can be restarted by depressing the
WARNING RESET key in SERVICE mode. If unit is
equipped with EPROM version A.02F.01 or later, a dilution cycle is not resumed when the motor coolant switch
closes.
On units equipped with Buffalo pumps, the “REFRIGERANT PUMP STARTUP DELAY” setpoint timer is dis-
9
abled at the instant of unit shutdown. This allows the
refrigerant pump to start at the beginning of the dilution
cycle without any delay.
PURGE
Since absorption chillers operate at pressures below
atmospheric, a purge system is required to remove system impurities which degrade performance and cause
internal corrosion. The system employs a purge pump
motor and purge solenoid valve (wired in parallel), which
are manually controlled by the operator from the micro
panel keypad, and a manual purge valve (piped in series). On a typical system, a minimum of one purge cycle
is recommended each week. To initiate a purge cycle,
depress the PUMP STATUS key until PURGE PUMP
OFF is displayed; immediately, depress the HOLD key.
When the MANUAL PUMP key is depressed in LOCAL,
REMOTE, or SERVICE mode with the purge pump off,
the pump runs, the purge solenoid valve is energized
(opened), and the display indicates PURGE PUMP ON.
After the pump runs for about 20 minutes and the suction pressure as measured on a field-supplied manometer falls to 1.6 mm of Hg absolute (0.03 PSIA), the operator opens the manual purge valve while the pump
continues to run. AFTER about 30 minutes, the purge
cycle is complete and the manual purge valve is closed.
10
Although the purge cycle is complete, the pump and
solenoid valve are energized for an additional 30 minutes or until the suction pressure falls to 1.6 mm of Hg
(0.03 PSIA). The pump and solenoid valve are then deenergized by depressing the MANUAL PUMP key a
second time, This allows the pump to clean its oil to extend pump life. After the purge pump runs for at least 10
minutes continuously, the 7 day and the unit lifetime purge
counters (displayed via the PURGE CYCLE COUNTER
key) increment by 1 count when the pump turns off.
The PURGE PUMP SERVICE INTERVAL key in the
Setpoints area of the keypad allows the operator to
select an appropriate interval for servicing the purge
pump. In PROGRAM mode, the key allows a cumulative
purge pump operating interval from 5 to 100 hours to be
entered. In addition, the display includes the number of
hours to be entered. In addition, the display includes the
number of hours that the pump has operated since the
last pump service. When the pump operating hours are
greater than or equal to the preset interval warning message is displayed. After servicing the pump, pressing
the WARNING RESET key in SERVICE mode clears
the message and resets the counter. Moving the CLK
jumper from OFF to ON position also clears the counter.
The default value for the service interval is 10 hours.
YORK INTERNATIONAL
FORM 155.16-O3
UNIT OPERATION
LOCAL OR REMOTE MODE
STEAM OR HOT WATER UNITS
BEGIN
➤
1
➤
➤
LOCAL
OR REMOTE
START
NO
YES
➤
2
➤
CYCLING SHUTDOWNDISPLAY “DAY-TIME-LVG
WATER TEMP < SETPOINT”
AS STATUS
YES
LVG
WATER TEMP <
SETPOINT
NO
➤
9
CYCLING SHUTDOWNDISPLAY “DAY-TIMESTEAM/HOT WATER
VALVE LOADED ABOVE
10%” AS STATUS
➤
PAGE 43
YES
STEAM/
HOT WATER
VALVE POS.
> 10%
NO
➤
PAGE 43
10
CLOSE CHILLED WATER
PUMP CONTACTS
TB4-44/45
➤
DISPLAY “COOLING
START SEQUENCE
INITIATED”
➤
YORK INTERNATIONAL
A
11
A
➤
START
30 SECOND TIMER
➤
➤
NO
CHILLED
WATER FLOW
SWITCH
CLOSED
➤
NO
30 SECOND
TIMER
ELAPSED
➤
YES
SAFETY
SHUTDOWNDISPLAY “DAYTIME-CHILLED
WATER FLOW
SWITCH” AS
STATUS
YES
➤
➤
11
CLEAR
30 SECOND TIMER
PAGE 44
➤
CLOSE CONDENSER
WATER PUMP
CONTACTS TB4-55/56
➤
START
30 SECOND TIMER
➤
➤
NO
CONDENSER
WATER FLOW
SWITCH
CLOSED
➤
NO
30 SECOND
TIMER
ELAPSED
YES
➤
CYCLING
SHUTDOWNDISPLAY “DAYTIME-CONDENSER
FLOW SWITCHAUTOSTART” AS
STATUS
YES
➤
➤
CLEAR
30 SECOND TIMER
➤
12
12
PAGE 45
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
DISPLAY “SYSTEM
RUN-LEAVING
CHILLED WATER
CONTROL
➤
REFRIG
TEMP >34°F
(1.1°C)
➤
YES
START SOLUTION PUMP (1M),
ABSORBER PUMP (50 HZ
MODELS YIA-10E3 – YIA-14F3
WITH FRANKLIN PUMPS)
NO
➤
➤
ENERGIZE 1R RELAY
TO OPEN STEAM/HOT
WATER SHUTOFF VALVE
➤
STEAM
UNIT
YES
➤
ENERGIZE 6SOL
TO OPEN STEAM
CONDENSATE
DRAIN VALVE
NO
➤
➤
➤
START REFRIGERANT PUMP (2M)
AND GENERATOR PUMP (4M)
(50 HZ MODELS YIA-10E3 – YIA-14F3)
NO
BUFFALO
PUMPS
YES
➤
START REFRIGERANT
FLOAT SWITCH
SHUTDOWN SETPOINT
TIMER (20 - 60 MIN)
YORK INTERNATIONAL
➤
➤
A
B
13
A
B
➤
FLOAT
SW 3F
CLOSED
➤
YES
REFRIG
PUMP (1F)
➤ START-UP DELAY
YES
TIMER
ELAPSED
FLOAT
SW 1F
CLOSED
NO
YES
➤
NO
➤
NO
➤
4
➤
➤
START
REFRIGERANT
PUMP (2M)
➤
PAGE 35
REFRIG
PUMP (2M)
RUNNING
NO
REFRIG
FLOAT SW
SHUTDOWN
TIMER
ELAPSED
➤
➤
YES
SAFETY SHUTDOWN –
DISPLAY “DAY-TIMEREFRIGERANT PUMP
FLOAT SW FAILURE”
AS STATUS
➤
YES
NO
➤
42
PAGE 86
FLOAT
SW 3F
CLOSED
➤
NO
YES
FLOAT
SW 1F
CLOSED
➤
NO
YES
➤
START REFRIG PUMP
START-UP DELAY SETPOINT TIMER (1-900 SEC)
WHEN 1F CLOSES
➤
START REFRIGERANT PUMP WHEN
“REFRIG PUMP START-UP DELAY
SETPOINT TIMER” (1F) HAS ELAPSED
➤
➤
FLOAT
SW 1F
CLOSED
FLOAT
SW 3F
OPEN
➤
YES
NO
➤
BOTH
REFRIG PUMP
START-UP (1F) AND
SHUTDOWN (3F)
DELAY SETPOINT
TIMERS
ELAPSED
SAFETY
SHUTDOWN –
DISPLAY “DAY-TIME➤
REF PUMP FLOAT
YES
SW CONFLICT”
AS STATUS
➤
NO
43
NO
PAGE 87
➤
➤
FLOAT
SW 1F
OPEN
NO
➤
YES
START REFRIG PUMP
SHUTDOWN DELAY SETPOINT
➤
TIMER (1-45 SEC)
WHEN 3F OPENS
NO
➤
➤
➤
SHUTDOWN REFRIG PUMP WHEN
“REFRIG PUMP SHUTDOWN DELAYSETPOINT TIMER” (3F) HAS ELAPSED
➤
➤
14
YES
FLOAT
SW 3F
OPEN
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
PULLDOWN
DEMAND
PROGRAMMED
YES
START PULLDOWN
INTERVAL TIMER
(0-255 MIN)
➤
YES
➤
NO
➤
PULLDOWN
DEMAND
PROGRAMMED
20-100%
YES
PULLDOWN
INTERVAL
ELAPSED
➤
NO
➤
YES
NO
PULLDOWN LOAD LIMIT (%) =
(STOP LIMIT-START LIMIT) T ELAPSED
T INTERVAL
➤
[
]
+
START
LIMIT
➤
➤
YES
PULLDOWN
LOAD LIMIT >
MAX ALLOWED
LOAD
VALUE
NO
➤
PULLDOWN
LOAD LIMIT <
FAX-4500
LOAD
LIMIT
YES
➤
➤
NO
➤
YES
PULLDOWN
LOAD LIMIT >
PWM LOAD
LIMIT
YES
REMOTE
MODE
NO
NO
➤
➤
➤
➤
NO
UNIT
LOADING =
PULLDOWN
LOAD
LIMIT
YES
➤
DISPLAY “SYSTEM RUNPULLDOWN LIMIT”
➤
LIMIT LOADING TO PULLDOWN
DEMAND LIMIT (%) VALUE
➤
➤
YORK INTERNATIONAL
A
15
➤
NO
A
➤
REMOTE
MODE
CONTROL PER FAX-4500 LEAVING
WATER TEMP SETPOINT
➤
YES
➤
YES
YES
NO
NO
➤
FAX4500
FAX-4500
LOAD LIMIT
> MAX
ALLOWED
LOADING
VALUE
UNIT
LOADING =
FAX-4500
LOAD LIMIT
➤
➤
NO
YES
➤
➤
PWM
REMOTE
LOAD LIMIT
(10-20)-100%
YES
➤
LIMIT UNIT LOADING TO FAX-4500
LOAD LIMIT (10-20) - 100%
➤
➤
DISPLAY “SYSTEM RUN
REMOTE LOAD LIMIT”
PWM REMOTE LOAD LIMIT (%) =
100- [PW-1(100-LOWER LIMIT)/10]
➤
NO
YES
PWM
LOAD LIMIT
> MAX
ALLOWED
LOADING
VALUE
➤
NO
➤
YES
UNIT
LOADING
> PWM
LOAD
LIMIT
NO
➤
➤
➤
➤
LIMIT UNIT LOADING TO PWM
REMOTE LOAD LIMIT (10-20)-100%
➤
PWM
REMOTE
TEMP
SETPOINT
YES
DISPLAY “SYSTEM RUN
REMOTE LOAD LIMIT”
NO
➤
CONTROL PER BASE
LEAVING WATER TEMP
SETPOINT (40-77°F)
°F OFFSET =
(PULSEWIDTH-1) (REMOTE RESET TEMP RANGE)
➤
10
SETPOINT = BASE SETPOINT + °F OFFSET
➤
➤
➤
16
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
CHECK PROGRAMMED
“MAX ALLOWED
LOADING” VALUE
(50-100%)
➤
AT MAX
ALLOWED
LOADING
YES
DISPLAY “SYSTEM RUN”
MAXIMUM COOLING
➤
➤
NO
LIMIT LOAD COMMAND
TO MAXIMUM ALLOWED
LOADING (50-100%)
➤
➤
CHECK CONDENSER
WATER FLOW SWITCH
@ TB2-20
➤
OPEN
FOR 30
SECONDS
YES
CYCLING SHUTDOWN
DISPLAY “DAY-TIME-COND
FLOW SWITCHAUTOSTART” AS STATUS
➤
NO
➤
➤
COMPARE LEAVING
CHILLED WATER TEMP TO
LEAVING WATER TEMP
SETPOINT
13
PAGE 46
➤
AUTO
SOLENOID
CONTROL
YES
➤
NO
LCWT
> (SP-2) &
< (SP+5)
YES
➤
REFRIG
LEVEL
FLOAT SW
OPEN
➤
YES
ENERGIZE (OPEN)
REFRIGERANT LEVEL
SOLENOID VALVE (3SOL)
NO
NO
➤
➤
DE-ENERGIZE (CLOSE)
REFRIGERANT LEVEL
SOLENOID VALVE (3SOL)
➤
➤
➤
YORK INTERNATIONAL
A
17
A
➤
YES
NO
➤
CYCLING SHUTDOWN-DISPLAY
“DAY-TIME-LOW WATER
TEMP-AUTOSTART”
AS STATUS
➤
NO
< 30
MINUTES
SINCE LCWT
SP RAISED
➤
➤
LCWT
< SP-2
YES
➤
14
LOW WATER TEMP
SHUTDOWN
THRESHOLD = PREVIOUS
SETPOINT-2
PAGE 48
➤
➤
NO
LCWT <
PREVIOUS
SP-2
YES
➤
CHECK AUXILIARY
SAFETY SHUTDOWN
INPUT @ TB-31
➤
CLOSED
YES
➤
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-AUXILIARY SAFETY
SHUTDOWN” AS STATUS
NO
➤
15
➤
PAGE 49
CHECK REMOTE/LOCAL
CYCLING INPUT @ TB2-13
➤
CLOSED
NO
➤
CYCLING SHUTDOWN- DISPLAY
“DAY-TIME-SYSTEM CYCLING
AUTOSTART” AS STATUS
YES
➤
➤
16
CHECK MULTI-UNIT
CYCLING INPUT @ TB2-9
PAGE 50
➤
18
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
CLOSED
NO
➤
CYCLING SHUTDOWN-DISPLAY
“DAY-TIME-MULTI-UNIT
CYCLING-AUTOSTART” AS STATUS
YES
➤
➤
17
CHECK DAILY SCHEDULE
START-STOP TIMES
PAGE 51
➤
SCHEDULED
FOR SHUTDOWN
YES
CYCLING SHUTDOWN-DISPLAY
“DAY-TIME-INTERNAL CLOCKAUTOSTART” AS STATUS
➤
NO
➤
18
➤
PAGE 52
CHECK LOW REFRIGERANT
TEMP SAFETY CUTOUT @
RELAY BOARD TB3-81
➤
TRIPPED
YES
SAFETY SHUTDOWN-DISPLAY
➤ “DAY-TIME-LOW REFRIGERANT TEMP
DIGITAL” AS STATUS
NO
➤
➤
19
CHECK REFRIGERANT
TEMP @ RT 8
PAGE 53
➤
➤
NO
SOLUTION
(ABSORBER)
PUMP
RUNNING
YES
> 35.5°F
(1.9°C)
NO
YES
➤
YORK INTERNATIONAL
➤
➤
B
A
19
B
A
➤
ENERGIZE SOLUTION PUMP (1M)
(ABSORBER PUMP ON 50 HZ
MODELS YIA-10E3 – YIA-14F3
WITH FRANKLIN PUMPS)
➤
➤
< 35.5°F
(1.9°C)
YES
DISPLAY “WARNING-LOW
REFRIGERANT
TEMPERATURE”
➤
NO
➤
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND
AUDIBLE ALARM UNTIL
RESET WITH
“WARNING RESET” KEY
YES
➤
➤
➤
DE-ENERGIZE (CLOSE)
STABILIZER REFRIGERANT
SOLENOID VALVE (2SOL)
> 36°F
(2.2°C)
PUT LOW REFRIGERANT TEMP
LOAD INHIBIT IN EFFECTINHIBIT UNIT LOADING
NO
➤
➤
LRT
LOAD
INHIBIT IN
EFFECT
BUFFALO
PUMPS
➤
NO
YES
➤
REFRIG
PUMP
RUNNING
NO
NO
YES
YES
➤
➤
➤
REMOVE LOW
REFRIGERANT TEMP
LOAD INHIBIT-ALLOW
UNIT LOADING
ENERGIZE (OPEN)
STABILIZER REFRIGERANT
SOLENOID VALVE (2SOL)
➤
➤
➤
CLEAR “LOW
REFRIGERANT TEMP”
WARNING MESSAGE WHEN
WARNING RESET KEY IS
PRESSED IN SERVICE MODE
DE-ENERGIZE SOLUTION PUMP (1M)
(ABSORBER PUMP ON 50 HZ
MODELS YIA-10E3 – YIA-14F3
WITH FRANKLIN PUMPS)
➤
YES
< 34°F
(1.1°C)
NO
➤
A
➤
➤
20
➤
B
YORK INTERNATIONAL
FORM 155.16-O3
A
B
➤
< 33°F
(0.5°C)
➤
NO
YES
➤
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-LOW REFRIGERANT
TEMP-ANALOG” AS STATUS
➤
➤
CHECK CHILLED WATER
FLOW SWITCH @ TB2-12
20
PAGE 56
➤
TRIPPED
➤
YES
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-CHILLED WATER
FLOW SWITCH” AS STATUS
NO
➤
23
➤
PAGE 59
CHECK STRONG
SOLUTION TEMP
@ RT3
➤
> 91°F
(32.8°C)
YES
NO
➤
< 91°F
(32.8°C)
FOR 1
MINUTE
YES
NO
➤
UNIT
RUNNING
30 MIN
YES
NO
➤
➤
➤
➤
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND
AUDIBLE ALARM UNTIL
RESET WITH
“WARNING RESET KEY”
DISPLAY
“WARNING-FAULTY
STRONG SOLN TEMP
SENSOR”
➤
➤
CLEAR “FAULTY STRONG
SOLN TEMP SENSOR”
WARNING MESSAGE WHEN
WARNING RESET KEY IS
PRESSED IN SERVICE MODE
YES
STRONG
SOLN TEMP
SENSOR
WARNING
IN EFFECT
NO
➤
➤
➤
YORK INTERNATIONAL
A
21
A
➤
BUFFALO
PUMPS
YES
NO
➤
EPROM
VERSION
A.02F.02 OR
LATER
NO
➤
DE-ENERGIZE (CLOSE)
MOTOR COOLANT
➤
YES
SOLENOID VALVE
(1SOL)
<150°F
(65.6°C)
NO
YES
➤
➤
➤
➤
DE-ENERGIZE (CLOSE)
MOTOR COOLANT
SOLENOID VALVE
(1SOL)
YES
< PROGRAMMED
OPEN
THRESHOLD
MINUS 10°F
(–23.3°C)
>160°F
(71.1°C)
YES
➤
ENERGIZE (OPEN)
MOTOR COOLANT
SOLENOID VALVE
(1SOL)
NO
NO
➤
➤
➤
➤
ENERGIZE (OPEN)
MOTOR COOLANT
SOLENOID VALVE
(1SOL)
YES
> PROGRAMMED
OPEN
THRESHOLD
127-160°F
(52.871.1°C)
NO
➤
➤
➤
➤
> 337°F
(169.4°C)
YES
➤
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-GEN SHELL HIGH
TEMP-ANA” AS STATUS
➤
➤
24
PAGE 62
CHECK GENERATOR HIGH TEMP SAFETY
INPUT (HTI) @ DIGITAL INPUT BOARD J2-1.
CALIBRATED TO TRIP @ 330°F (165.6°C)
➤
TRIPPED
YES
SAFETY SHUTDOWN-DISPLAY
➤ “DAY-TIME-GEN SHELL HIGH TEMPMAN RESET” AS STATUS
NO
➤
➤
22
A
25
PAGE 63
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
YES
BUFFALO
PUMPS
NO
➤
CHECK PUMP MOTOR
COOLANT LEVEL FLOAT
SWITCH (2F) INPUT
@ TB1-11
➤
➤
CLOSED
NO
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-MOTOR COOLANT
LEVEL FLOAT SWITCH”
AS STATUS
YES
➤
➤
➤
26
CHECK GENERATOR HIGH
PRESSURE SAFETY (HP1) INPUT
@ TB1-32. CALIBRATED TO TRIP
@ 13.73 PSIA (94.7 kPa)
PAGE 64
➤
➤
TRIPPED
YES
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-GEN SHELL HIGH
PRESS-DIG” AS STATUS
NO
➤
➤
28
CHECK GENERATOR
PRESSURE @ PT1
PAGE 66
➤
> 15 PSIA
(103.4 kPa)
➤
YES
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-CHILLED WATER
FLOW SWITCH” AS STATUS
NO
➤
➤
29
PAGE 67
➤
DISPLAY “WARNING-HIGH GEN
PRESSURE OVERRIDE”
YES
> 10 PSIA
(68.9 kPa)
NO
➤
➤
YORK INTERNATIONAL
A
B
23
A
B
➤
➤
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND AUDIBLE
ALARM UNTIL RESET WITH
“WARNING RESET” KEY
< 6 PSIA
(41.4 kPa)
➤
YES
HIGH GEN
PRESSURE
OVERRIDE IN
EFFECT
YES
➤
➤
REMOVE “HIGH GENERATOR PRESSURE
OVERRIDE” -ALLOW UNIT LOADING TO
>30% STEAM/HOT WATER VALVE POSITION
➤
➤
PUT HIGH GENERATOR PRESSURE
OVERRIDE IN EFFECT-LIMIT
STEAM/HOT WATER VALVE
POSITION TO 30%
➤
CLEAR “HIGH GENERATOR PRESSURE
OVERRIDE” WARNING MESSAGE WHEN
WARNING RESET PRESSED IN SERVICE MODE
➤
➤
EPROM
VERSION
A.02F.02
OR
LATER
NO
YES
➤
YES
PRIMARY
LIMITED
ADC IN
EFFECT
NO
➤
YES
SECONDARY LIMITED
ADC IN
EFFECT
NO
➤
➤
NORMAL
ADC IN
EFFECT
YES
NO
➤
CHECK AUTO-DECRYSTALLIZATION
(ADC) TEMP @ RT2
➤
➤
>160°F
(71.1°C)
YES
➤
START 10-MINUTE
ADC TIMER
NO
D
➤
C
➤
B
➤
➤
➤
24
A
E
F
YORK INTERNATIONAL
A
C
B
E
F
1F & 3F
OPEN
(REFRIG PUMP
SHUTDOWN)
NO
D
➤
FORM 155.16-O3
➤
BUFFALO
PUMPS
NO
YES
➤
➤
YES
1F & 3F
OPEN
(REFRIG PUMP
SHUTDOWN)
NO
➤
➤
➤
PERFORM PRIMARY
LIMITED ADC
PERFORM
NORMAL ADC
➤
➤
➤
➤
DISPLAY “SYSTEM RUNPRIMARY LIMITED
AUTO-DECRYST”
➤
ENERGIZE (OPEN) STABILIZER
REFRIGERANT SOLENOID
VALVE (2SOL) FOR FIRST 2
MINUTES OF NORMAL ADC
LIMIT STEAM/HOT
WATER VALVE
POSITION TO 50%
➤
➤
➤
DISPLAY “SYSTEM
RUN-AUTOMATIC
DECRYSTALLIZATION”
DE-ENERGIZE (CLOSE)
STABILIZER REFRIGERANT
SOLENOID VALVE (2SOL)
➤
➤
LIMIT STEAM/ HOT
WATER VALVE
POSITION TO 50%
ADC
TIMER
ELAPSED
➤
YES
NO
➤
➤
YES
1F & 3F
CLOSED
➤ (REFRIG PUMP
NO
RUNNING)
➤
ADC
TEMP
@ RT2 >150°F
(65.6°C)
BUFFALO
PUMPS
CLEAR PRIMARY
LMTD AUTO
➤
NO
DECRYSTALLIZATION
MESSAGE
➤
YES
NO
YES
➤
ALLOW LOADING TO
>50% STEAM/HOT
WATER VALVE
POSITION
➤
➤
PERFORM
SECONDARY
LIMITED ADC
➤
➤
YES
➤
ADC
TIMER
ELAPSED
➤
C
YES
➤
NO
D
NO
YES
➤
YORK INTERNATIONAL
B
➤
➤
➤ A
➤
START 15-MINUTE
SECONDARY
LIMITED ADC TIMER
ADC
TEMP @
RT2 <150°F
(65.6°C)
25
B
➤
A
C
D
➤
➤
ALLOW
STEAM/HOT
WATER VALVE
LOADING
TO >50%
➤
DISPLAY “SYSTEM RUNSECONDARY LMTD
AUTO-DECRYST”
CLEAR
AUTOMATIC DECRYSTALLIZATION
MESSAGE
➤
➤
➤
DRIVE STEAM/HOT WATER
VALVE TO 0% POSITION
➤
SET ADC
TIMER TO
10 MINUTES
YES
➤
➤
15 MIN.
SECONDARY
LMTD ADC
TIMER
ELAPSED
➤
NO
YES
1F & 3F
CLOSED
(REFRIG PUMP
RUNNING)
>10 MIN.
LEFT ON
SECONDARY
LMTD ADC
TIMER
➤
YES
➤
NO
SET ADC TIMER TO
TIME REMAINING ON
SECONDARY LIMITED
ADC TIMER
NO
➤
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-RFS-CHK FOR
CRYSTALLIZATION” AS STATUS
➤
➤
➤
42
NO
PAGE 86
EPROM
VERSION
A.02F.00
YES
➤
CHECK LEAVING
CHILLED WATER TEMP
@ RT 1
➤
NO
> SETPOINT
YES
➤
CHECK REFRIGERANT
TEMP LEAVING THE CONDENSER
(RTLC) @ RT 9
➤
CHECK STRONG SOLUTION
TEMP @ RT 3
B
➤
➤
➤
26
A
C
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
B
C
RTLC
>72°F (22.2°C)
& <97°F
(36.1°C)
MAX ALLOWED STRONG
SOLUTION TEMP =
(1.4 x RTLC) + 69.2
➤
➤
MAX ALLOWED STRONG
SOLUTION TEMP =
(1.285 x RTLC) + 80.355
➤
➤
MAX ALLOWED STRONG
SOLUTION TEMP =
(1.307 x RTLC) + 78.072
➤
NO
➤
➤
NO
YES
➤
STRONG
SOLUTION
TEMP CONTROL
IN EFFECT
RTLC
>98°F (36.7°C)
& <104°F
(40°C)
YES
➤
NO
➤
YES
RTLC
>105°F (40.6°C)
& <117°F
(47.2°C)
YES
➤
NO
➤
NO
➤
YES
STRONG
SOLUTION
TEMP CONTROL IN
EFFECT
➤
NO
➤
➤
YES
STRONG
SOLUTION
TEMP <
(ALLOWED
-4)
NO
STRONG
SOLUTION
TEMP CONTROL IN
EFFECT
YES
YES
➤
➤
➤
CLEAR
STRONG
SOLUTION
TEMP
CONTROL
MESSAGE
STRONG
SOLUTION
TEMP >
(ALLOWED
-2)
PUT STRONG
SOLUTION TEMP
CONTROL IN
EFFECT
NO
➤
➤
REMOVE STRONG
SOLUTION TEMP
➤ CONTROL-RETURN TO
AUTOMATIC LEAVING
CHILLED WATER TEMP
CONTROL
DISPLAY “SYSTEM
RUN-STRONG
SOLUTION TEMP
CONTROL”
➤
➤
INHIBIT STEAM/HOT
WATER VALVE
LOADING
➤
➤
YORK INTERNATIONAL
➤
A
B
27
A
B
➤
BUTTERFLY
VALVE
NO
➤
APPLY 2 SECOND CLOSE
PULSE TO STEAM/HOT
WATER
VALVE EVERY 60 SECONDS
UNTIL STRONG SOLUTION
TEMP < (ALLOWED-4)
YES
➤
APPLY 1 SECOND CLOSE
PULSE TO STEAM/HOT WATER
VALVE EVERY 15 SECONDS
UNTIL STRONG SOLUTION
TEMP < (ALLOWED-4)
➤
➤
➤
NO
UNIT
RUNNING
> 30
MINUTES
YES
➤
CHECK ENTERING
CONDENSER WATER
TEMP @ RT5
➤
< 74°F
(23.3°C)
YES
➤
EPROM
VERSION
A.02F.02 OR
LATER
YES
➤
CHECK STRONG
SOLUTION TEMP
@ RT3
NO
➤
DISPLAY “SYSTEM
RUN-LOW ECDWT
LIMIT IN EFFECT”
➤
➤
➤
NO
YES
>
LOW ECWT
SOLUTION TEMP
OVERRIDE
SETPOINT
➤
LIMIT UNIT LOADING
PER STEAM/HOT WATER
VALVE PROFILE AS PER
PROGRAMMED VALVE
PART NUMBER
➤
➤
28
➤
A
NO
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
CHECK ENTERING
CONDENSER WATER
TEMP @ RT 5
➤
➤
YES
ENT
COND
WATER TEMP
WARNING IN
EFFECT
YES
< MAX
ALLOWED
ENTERING
COND WATER
TEMP
NO
NO
➤
➤
➤
CLEAR “ENT
CONDENSER
WATER TEMP HIGH
LIMIT WARNING
MESSAGE” WHEN
WARNING RESET
KEY PRESSED IN
SERVICE MODE
>
PROGRAMMED
LIMIT FOR 10
MINUTES
NO
YES
➤
UNIT
RUNNING
> 30
MINUTES
YES
NO
➤
➤
➤
REMOVE ENT COND
WATER TEMP HIGH
LIMIT. ALLOW UNIT
LOADING TO > 60%
STEAM/HOT WATER
VALVE POSITION
➤
DISPLAY “WARNINGENT COND WATER
TEMP HIGH LIMIT”
➤
PUT ENTERING
CONDENSER
WATER TEMP HIGH
LIMIT IN EFFECTLIMIT STEAM/HOT
WATER VALVE
POSITION TO 60%
➤
➤
YORK INTERNATIONAL
➤
A
CLOSE ALARM
CONTACTS TB4-89/90
TO SOUND AUDIBLE
ALARM UNTIL RESET
WITH WARNING
RESET KEY
29
A
➤
➤
CHECK ABSORBER
PUMP OVERLOADS
INPUT @ TB1-71
YES
50 HZ
YIA-10ES YIA-14F3 WITH
FRANKLIN
PUMPS
NO
➤
➤
YES
CHECK SOLUTION
PUMP OVERLOADS
INPUT @ TB1-70
OPEN
NO
➤
➤
SAFETY
SHUTDOWNDISPLAY “DAYTIME-ABSORBER
PUMP OVERLOADS
OPEN” AS STATUS
YES
➤
OPEN
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-SOLUTION PUMP
OVERLOADS OPEN”
AS STATUS
NO
➤
➤
34
30
PAGE 74
PAGE 68
➤
CHECK
GENERATOR PUMP
OVERLOADS INPUT
@ TB1-18
➤
➤
OPEN
➤
NO
CHECK
REFRIGERANT
PUMP OVERLOADS
INPUT @ TB1-70
YES
➤
➤
SAFETY SHUTDOWN
DISPLAY “DAY-TIME-GEN
PUMP OVERLOADS OPEN”
AS STATUS
YES
OPEN
36
32
PAGE 77
PAGE 71
➤
30
➤
➤
NO
➤
SAFETY SHUTDOWN
DISPLAY “DAY-TIME-REFRIG
PUMP OVERLOADS OPEN”
AS STATUS
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
STEAM
UNIT
NO
➤
CHECK HOT
WATER SUPPLY
TEMP @ RT7
YES
➤
➤
CHECK STEAM
SUPPLY TEMP
@ RT7
JP5
IN
> 270°F
➤ (132.2°C)
NO
YES
➤
YES
JP5
IN
> 255°F
(123.9°C)
YES
➤
NO
➤
NO
YES
➤
> 340°F
(171.1°C)
NO
YES
➤
SAFETY SHUTDOWNDISPLAY “DAY-TIME-HIGH
HOT WATER SUPPLY TEMP”
AS STATUS
NO
➤
➤
➤
➤
YES
> 290°F
(143.3°C)
➤
39
> 250°F
(121.1°C)
➤
➤
SAFETY SHUTDOWNDISPLAY “DAY-TIME-HIGH
STEAM SUPPLY TEMP”
AS STATUS
PAGE 80
38
YES
> 266°F
(130°C)
NO
NO
PAGE 81
YES
➤
➤
➤
➤
NO
> 337°F
(169.4°C)
< 249.5°F
(120.8°C)
PUT HIGH HOT
WATER TEMP
WARNING IN EFFECT
NO
YES
YES
➤
➤
➤
➤
PUT STEAM
SUPPLY TEMP
WARNING IN EFFECT
YES
DISPLAY “WARNINGHIGH HOT WATER
SUPPLY TEMP”
> 285°F
(140.6°C)
NO
➤
➤
CLOSE ALARM
CONTACTS TB4-89/90
TO SOUND AUDIBLE
ALARM
DISPLAY “WARNING
HIGH STEAM SUPPLY
TEMPERATURE”
➤
➤
➤
➤
➤
< 265.5°F
YES (129.7°C)
HIGH
HOT WATER
TEMP WARNING
IN EFFECT
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND
AUDIBLE ALARM
NO
➤
NO
➤
YES
D
➤
YORK INTERNATIONAL
C
➤
B
➤
➤
➤
A
E
31
A
C
B
D
E
➤
➤
➤
< 336°F
(168.9°C)
REMOVE HIGH HOT
WATER TEMP WARNING
➤
NO
YES
➤
NO
< 284°F
(140°C)
YES
➤
➤
➤
CLEAR HIGH HOT
WATER TEMP
WARNING MESSAGE
HIGH
STEAM
SUPPLY TEMP
WARNING IN
EFFECT
YES
➤
➤
REMOVE HIGH
STEAM SUPPLY
TEMP WARNING
OPEN ALARM
CONTACTS TB4-89/90
➤
NO
CLEAR HIGH
STEAM SUPPLY
WARNING MESSAGE
➤
➤
OPEN ALARM
CONTACTS
TB4-89/90
➤
➤
➤
EPROM
VERSION
A.02F.02
OR LATER
YES
➤
NO
➤
CHECK STEAM
SUPPLY PRESSURE
@ PT2
➤
➤
PAGE 82
SAFETY SHUTDOWNDISPLAY “DAY-TIME-HIGH
STEAM SUPPLY PRESSURE” AS STATUS
➤
40
YES
> 29 PSIA
(199.9 kPa)
NO
➤
➤
PUT HIGH STEAM
SUPPLY PRESSURE
WARNING IN EFFECT
YES
>26 PSIA
(179.3 kPa)
➤
DISPLAY “WARNINGHIGH STEAM
SUPPLY PRESSURE”
B
➤
➤
➤
32
A
NO
C
YORK INTERNATIONAL
FORM 155.16-O3
A
C
B
➤
CLOSE ALARM CONTACTS
TB4-88/90 TO SOUND
AUDIBLE ALARM
➤
➤
NO
> 25.5 PSIA
(175.8 kPa)
YES
➤
➤
REMOVE HIGH STEAM
SUPPLY PRESSURE
WARNING
YES
HIGH STEAM
SUPPLY PRESS
WARNING IN
EFFECT
➤
CLEAR HIGH STEAM
SUPPLY PRESSURE
WARNING MESSAGE
NO
➤
➤
OPEN ALARM
CONTACTS TB4-89/90
➤
➤
➤
CHECK PURGE PUMP
OVERLOADS INPUT
@ TB3-80
➤
OPEN
YES
➤
PURGE
PUMP
OVERLOAD
WARNING IN
EFFECT
DISPLAY “WARNINGPURGE PUMP
OVERLOADS OPEN”
➤
CLEAR PURGE
PUMP OVERLOAD
WARNING MESSAGE
WHEN WARNING
RESET KEY
PRESSED IN
SERVICE MODE
➤
➤
YES
NO
NO
➤
➤
➤
CLOSE ALARM
CONTACTS TB4-89/90
TO SOUND AUDIBLE
ALARM UNTIL RESET
WITH WARNING
RESET KEY
COMPARE PURGE PUMP OPERATING
HOURS TO PURGE PUMP SERVICE
INTERVAL SETPOINT
YORK INTERNATIONAL
➤
A
33
A
➤
OPER
HRS.
> SETPOINT
YES
DISPLAY “WARNINGPURGE PUMP SERVICE
RECOMMENDED”
➤
➤
NO
CLOSE ALARM
CONTACTS TB4-89/90 TO
SOUND AUDIBLE ALARM
UNTIL RESET WITH
WARNING RESET KEY
➤
PRESS
WARNING
RESET KEY IN
SERVICE
MODE
➤
NO
YES
➤
PRESS PURGE PUMP
OPERATING HOURS TO
ZERO
➤
CLEAR PURGE PUMP
SERVICE WARNING
MESSAGE
➤
➤
PURGE
DESIRED
YES
➤
PERFORM MANUAL
PURGE OPERATION
➤
NO
➤
NO
➤
➤
YES
YES
➤
➤
DELETE OLDEST DAY’S
COUNT FROM 7-DAY
PURGE COUNTER
PURGE
PUMP RUNS
> 10 MINUTES
12:00
MIDNIGHT
INCREMENT TOTAL
(LIFETIME) AND
7-DAY PURGE
COUNTERS WHEN
PURGE PUMP IS
TURNED OFF
NO
➤
➤
34
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
CHECK BATTERY
VOLTAGE ON “REAL TIME
CLOCK” IC CHIP, U16 ON
MICRO BOARD
➤
OK
➤
NO
DISPLAY “REPLACE RTC,
U16 - REPROGRAM
SETPOINTS”
➤
YES
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND
AUDIBLE ALARM UNTIL
RESET WITH WARNING
RESET KEY
➤
➤
CLEAR RTC BATTERY
WARNING MESSAGE
WHEN WARNING RESET
KEY PRESSED IN
SERVICE MODE
➤
YES
RTC
BATTERY
WARNING
IN EFFECT
NO
➤
➤
POWER
FAILURE
YES
➤ 41
PAGE 83
NO
➤
4
➤
PAGE 14
NO
LOCAL
OR
REMOTE
STOP
YES
➤
DE-ENERGIZE 1R RELAY TO CLOSE
STEAM/HOT WATER SHUTOFF VALVE
DILUTION CYCLE
5
➤
➤
START 6-MINUTE DILUTION CYCLE
TIMER-BEGIN DILUTION CYCLE
8
➤
➤
YORK INTERNATIONAL
A
35
A
➤
CHECK LOW
REFRIGERANT TEMP
SAFETY CUTOUT
SWITCH - (LRT) @
RELAY BOARD TB3-81
➤
➤
SAFETY SHUTDOWNDISPLAY “DAY-TIME-LOW
REFRIGERANT TEMPDIGITAL” AS STATUS
YES
TRIPPED
NO
➤
PAGE 53
➤
21
22
PAGE 54
➤
CHECK REFRIGERANT
LEVEL FLOAT SWITCH
(1F) @ TB1-10
➤
OPEN ?
➤
YES
DISPLAY “DILUTION
INTERRUPTED-REF
➤ LEVEL FLOAT SW”
AS STATUS
TERMINATE
DILUTION
SHUTDOWN
ALL PUMPS
NO
➤
STEAM
UNIT
YES
➤
DE-ENERGIZE
6 SOL TO
CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
➤
➤
➤
CHECK
REFRIGERANT
TEMP @ RT 8
1
➤
36
PAGE 11
A
YORK INTERNATIONAL
FORM 155.16-O3
A
➤
< 35.5°F
(1.9°C)
➤
DISPLAY “WARNINGLOW REFRIGERANT
TEMPERATURE” AS
STATUS
YES
NO
➤
CLOSE ALARM CONTACTS
TB4-89/90 TO SOUND AUDIBLE
ALARM UNTIL RESET WITH
“WARNING RESET KEY”
➤
BUFFALO
PUMPS
YES
NO
➤
REFRIG
PUMP
RUNNING
NO
YES
➤
➤
ENERGIZE (OPEN)
STABILIZER REFRIGERANT
SOLENOID VALVE (2SOL)
➤
➤
REFRIG
TEMP < 34°F
(1.1°C)
➤
NO
YES
➤
TERMINATE DILUTIONSHUTDOWN ALL PUMPS
EXCEPT CHILLED
WATER PUMP
➤
➤
DE-ENERGIZE
6 SOL TO CLOSE
STEAM
CONDENSATE
DRAIN VALVE
YES
STEAM
UNIT
NO
➤
➤
➤
YORK INTERNATIONAL
A
B
37
A
B
➤
START 30 MINUTE
CHILLED WATER
PUMP TIMER
➤
➤
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
YES
REFRIG
TEMP < 33°F
(.6°C)
NO
➤
SAFETY SHUTDOWNDISPLAY “DAY-TIME-LOW
REFRIGERANT TEMPANALOG” AS STATUS
➤
➤
PAGE 56
6
YES
REFRIG
TEMP > 36°F
(2.2°C)
➤
NO
DE-ENERGIZE
(CLOSE) STABILIZER
REFRIGERANT SOLENOID
VALVE (2 SOL)
➤
➤
➤
START ALL
PUMPS
YES
REFRIG
TEMP > 37°F
(2.8°C)
NO
➤
30 MIN
CHILLED WATER
PUMP TIMER
ELAPSED
YES
➤
SHUTDOWN
CHILLED
WATER PUMP
NO
➤
C
➤
B
➤
38
➤
A
YORK INTERNATIONAL
D
A
D
➤
➤
➤
NO
C
B
➤
FORM 155.16-O3
STEAM
UNIT
LOCAL OR
REMOTE
START
BUFFALO
PUMPS
YES
NO
YES
YES
NO
➤
2
➤
PAGE 11
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE
DRAIN VALVE
CHECK MOTOR
COOLANT LEVEL
FLOAT SWITCH
(2F) @ TB1-11
➤
➤
5
➤
PAGE 35
OPEN?
NO
SAFETY
SHUTDOWNDISPLAY “DAYTIME-MOTOR
➤
COOLANT
YES
LEVEL
FLOAT SW” AS
STATUS
➤
➤
27
PAGE 64
➤
CHECK
ABSORBER PUMP
OVERLOAD INPUT
@ TB1-71
YES
50 HZ
YIA-10ES
YIA-14F3 WITH
FRANKLIN
PUMPS
NO
➤
➤
➤
YES
OPEN
CHECK SOLUTION
PUMP OVERLOADS
INPUT @ TB-71
NO
➤
➤
SAFETY SHUTDOWNDISPLAY “DAY-TIMEABSORBER PUMP
OVERLOADS OPEN”
AS STATUS
OPEN
➤
NO
➤
35
31
PAGE 74
B
➤
➤
A
YORK INTERNATIONAL
YES
SAFETY SHUTDOWNDISPLAY “DAY-TIME➤
SOLUTION PUMP
OVERLOADS OPEN”
AS STATUS
PAGE 68
39
A
B
➤
➤
➤
CHECK
GENERATOR
PUMP OVERLOAD
INPUT @ TB1-18
CHECK
REFRIGERANT
PUMP OVERLOAD
INPUT @ TB1-70
➤
OPEN
NO
YES
➤
➤
OPEN
SAFETY
SHUTDOWN-DISPLAY
“DAY-TIME-GEN PUMP
OVERLOADS OPEN”
AS STATUS
➤
YES
SAFETY SHUTDOWNDISPLAY “DAY-TIMEREFRIG PUMP
OVERLOADS OPEN”
AS STATUS
NO
➤
33
PAGE 71
➤
PAGE 77
➤
37
CHECK CHILLED
WATER FLOW
SWITCH @ TB2-12
➤
OPEN?
YES
➤
TERMINATE
DILUTIONSHUTDOWN
ALL PUMPS
NO
➤
STEAM
UNIT
YES
➤
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
➤
B
➤
40
➤
A
YORK INTERNATIONAL
FORM 155.16-O3
A
B
➤
➤
CHECK CONDENSER
WATER FLOW
SWITCH @ TB2-20
DISPLAY “DILUTION
INTERRUPTED-CH
WATER FLOW SW”
AS STATUS
➤
➤
TERMINATEDILUTION
SHUTDOWN
ALL PUMPS
YES
OPEN
FOR 30
CONTINUOUS
SECONDS
➤
NO
➤
➤
➤
DE-ENERGIZE
6 SOL TO
CLOSE STEAM
CONDENSATE
DRAIN VALVE
YES
FLOW
SWITCH
CLOSED
STEAM
UNIT
➤
YES
RESUME
DILUTION
START ALL
PUMPS
NO
NO
➤
➤
CHECK STRONG
SOLUTION TEMP
@ RT 3
STEAM
UNIT
➤
➤
NO
NO
➤
➤
YES
YES
>136°F
(57.8°C)
➤
LOCAL
OR
REMOTE
START
➤
DISPLAY “DILUTION
INTERRUPTED-COND
WATER FLOW SW”
AS STATUS
NO
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE
DRAIN VALVE
➤
YES
➤
DISPLAY “DAY-TIMEFLS-CHECK FOR
CRYSTALLIZATION”
AS STATUS
PAGE 11
➤
2
➤
NO
➤
➤
5
UNIT
SW
IN STOP/
RESET
PAGE 35
➤
➤ YES
NO
OPERATOR PRESS
WARNING RESET
IN SERVICE
MODE
YES
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
1
➤
YORK INTERNATIONAL
➤
A
B
PAGE 11
41
B
➤
A
➤
➤
RESUME
DILUTIONSTART ALL
PUMPS
YES
FLOW
SWITCH
CLOSED
NO
➤
➤
YES
CHECK STRONG
SOLUTION TEMP
@ RT 3
STEAM
UNIT
NO
➤
NO
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE
DRAIN VALVE
>136°F
(57.8°C)
➤
➤
LOCAL
OR REMOTE
START
NO
➤
➤
5
2
PAGE 11
➤
PAGE 35
➤
*
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
SAFETY SHUTDOWN-DISPLAY
“DAY-TIME-CDFL-CHECK FOR
CRYSTALLIZATION” AS STATUS
6 MINUTE
DILUTION
CYCLE TIMER
ELAPSED
LOCAL
OR REMOTE
START
➤
NO
PAGE 35
➤
PAGE 11
STEAM
UNIT
YES
➤
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
YES
2
TERMINATE
DILUTIONSHUTDOWN ALL
PUMPS
➤
➤
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
➤
➤
UNIT SW
IN STOP/
RESET
➤ YES
NO
➤ 8
YES
➤
NO
NO
➤
1
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
PAGE 11
➤
1
42
PAGE 11
YORK INTERNATIONAL
FORM 155.16-O3
SAFETY & CYCLING SHUTDOWN
UNIT OPERATION SUBROUTINES
PAGE 11
9
➤
CLOSE CYCLING
STATUS
CONTACTS TB4-40/41
➤
➤
LVG WATER
TEMP >
SETPOINT
YES
➤
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
10
➤ 2
PAGE 11
PAGE 11
➤
CLOSE CYCLING
STATUS CONTACTS
TB4-40/41
➤
➤
YES
STEAM/
HOT
WATER
VALVE >
10%
NO
➤
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
YORK INTERNATIONAL
➤ 2
PAGE 11
43
11
PAGE 12
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
START 30 MINUTE
CHILLED WATER
PUMP TIMER
➤
➤
CHILLED
WATER PUMP
TIMER
ELAPSED
YES
➤
OPEN CHILLED
WATER PUMP
CONTACTS
TB4-44/45
NO
➤
➤
➤
UNIT
SW IN
STOP/RESET
NO
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
NO
LOCAL
OR REMOTE
START
YES
➤
2
PAGE 11
44
YORK INTERNATIONAL
FORM 155.16-O3
12
PAGE 12
➤
CLOSE CYCLING
STATUS CONTACTS
TB4-40/41
➤
OPEN CHILLED WATER
PUMP CONTACTS
TB4-44/45
➤
OPEN CONDENSER
WATER PUMP CONTACTS
TB4-55/56
➤
➤
COND
FLOW SW
CLOSED
YES
➤
OPEN CYCLING
STATUS
CONTACTS
TB4-40/41
NO
➤
➤
2
PAGE 11
UNIT
SW IN
STOP/RESET
NO
YES
➤
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
➤
➤
NO
LOCAL
OR REMOTE/
START
YES
➤
2
PAGE 11
YORK INTERNATIONAL
45
PAGE 17
13
➤
CLOSE CYCLING
STATUS CONTACTS
TB4-40/41
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
STEAM
UNIT
YES
➤
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTIONSHUTDOWN ALL
PUMPS
➤
➤
COND
FLOW SW
CLOSED
➤
YES
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
➤
NO
2
➤
PAGE 11
CHECK STRONG
SOLUTION TEMP
@ RT3
➤
> 136°F
(57.8°C)
NO
SAFETY SHUTDOWN
DISPLAY “DAY-TIME-CDFLCHECK FOR
➤
CRYSTALLIZATION”
AS STATUS
YES
B
➤
➤
➤
46
A
C
YORK INTERNATIONAL
➤
FORM 155.16-O3
A
C
B
➤
➤
➤
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
NO
UNIT SW
IN STOP/
RESET
➤
YES
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
OPEN CYCLING
STATUS CONTACTS
TB4-40/41
➤
➤
➤
YES
➤
NO
YES
➤
2
UNIT SW
IN STOP/
RESET
➤
NO
LOCAL
OR
REMOTE
START
PAGE 11
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
NO
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
47
PAGE 18
14
➤
CLOSE CYCLING STATUS
CONTACTS TB4-40/41
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
LCWT
> (SP + 2)
YES
OPEN CYCLING
➤ STATUS CONTACTS
@ TB4-40/41
➤ 2
PAGE
11
NO
➤
UNIT
SW IN
STOP/
RESET
YES
➤
LCWT
> SP
YES
OPEN CYCLING
➤ STATUS CONTACTS
TB4-40/41
➤
NO
NO
➤
➤
➤
NO
NO
PAGE 11
LOCAL
OR REMOTE
➤ 2
YES
START
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
48
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 18
15
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
AUX
SAFETY
INPUT
OPEN
YES
UNIT
SW IN
STOP/
RESET
➤
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
NO
PAGE 11
LOCAL
OR REMOTE
➤ 2
YES
START
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
YORK INTERNATIONAL
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
49
PAGE 18
16
➤
CLOSE CYCLING STATUS
CONTACTS TB4-40/41
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
TB2-13
CLOSED
OPEN CYCLING
➤ STATUS CONTACTS
TB4-40/41
YES
➤ 2
PAGE 11
NO
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
CHECK MICRO BOARD
PROGRAM JUMPER J54
➤
OUT
➤
YES
NO
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
EXCEPT CHILLED
WATER PUMP
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
➤
STEAM
UNIT
50
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 19
17
➤
CLOSE CYCLING STATUS
CONTACTS TB4-40/41
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
TB2-9
CLOSED
OPEN CYCLING
➤ STATUS CONTACTS
TB4-40/41
YES
➤ 2
PAGE 11
NO
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
CHECK MICRO BOARD
PROGRAM JUMPER J54
➤
OUT
➤
YES
NO
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
EXCEPT CHILLED
WATER PUMP
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
➤
STEAM
UNIT
YORK INTERNATIONAL
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
51
PAGE 19
18
➤
CLOSE CYCLING STATUS
CONTACTS TB4-40/41
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
➤
SCHEDULED
FOR
START
YES
OPEN CYCLING
➤ STATUS CONTACTS
TB4-40/41
➤ 2
PAGE 11
NO
➤
LOCAL
OR
REMOTE
START
YES
NO
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
52
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 19
19
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
21
PAGE 36
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
YES
➤
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS EXCEPT
CHILLED WATER PUMP
➤
START 30 MINUTE
CHILLED WATER
PUMP TIMER
➤
➤
CHECK
REEFRIGERANT
TEMP @ RT 8
➤
➤
YES
30 MIN.
CH WATER
PUMP TIMER
ELAPSED
➤
SHUTDOWN
CHILLED
WATER
PUMP
NO
> 37°F
(2.8°C)
YES
NO
➤
B
➤
YORK INTERNATIONAL
➤
A
C
53
➤
A
C
B
➤
➤
CHECK STRONG
SOLUTION TEMP
@ RT 3
START
ALL PUMPS
➤
➤
>136°F
YES (57.8°C)
STEAM
UNIT
NO
YES
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE DRAIN
VALVE
NO
➤
➤
➤
START 6-MINUTE
DILUTION CYCLE
TIMER
DISPLAY “DAY-TIME-LRTCHK FOR CRYSTALLIZATION”
AS STATUS
➤
➤
➤
➤
➤
SHUTDOWN
CHILLED
WATER
PUMP
YES
ENTER DILUTION
CYCLE @ 22
PAGE 36
30 MIN.
CHILL WATER
PUMP TIMER
ELAPSED
➤
NO
➤
EXIT DILUTION
CYCLE @
*
PAGE 42
➤
LRT
CUTOUT
TRIPPED
YES
➤
➤
➤
6 MIN.
DILUTION
TIMER
ELAPSED
UNIT
SW IN
STOP/
RESET
NO
NO
➤
LRT
CUTOUT
TRIPPED
➤
➤
NO
YES
➤
NO
YES
YES
C
D
➤
B
➤
54
➤
A
E
YORK INTERNATIONAL
B
C
D
E
➤
A
➤
FORM 155.16-O3
➤
➤
➤
OPERATOR
PRESS WARNING
RESET KEY IN
SERVICE
MODE
UNIT
SW IN
STOP/
RESET
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
NO
➤
NO
➤
YES
➤
YES
➤
STEAM
UNIT
NO
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
OPEN
SAFETY
STATUS
CONTACTS
TB4-42/43
YES
➤
➤
LOCAL
OR REMOTE
NO
START
YES
➤
➤
2
➤
PAGE 11
➤
LOCAL
OR REMOTE
START
➤
DE-ENERGIZE
6 SOL TO
CLOSE STEAM
CONDENSATE
DRAIN VALVE
➤
NO
YES
LRT
CUTOUT
TRIPPED
YES
➤
NO
➤
2
➤
PAGE 11
NO
UNIT
SW IN
STOP/
RESET
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
55
PAGE 21
20
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
➤
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS EXCEPT
CHILLED WATER PUMP
➤
START 30 MINUTE
CHILLED WATER
PUMP TIMER
➤
➤
6
PAGE 38
➤
CHECK
REEFRIGERANT
TEMP @ RT 8
➤
>36°F
(2.2°C)
YES
➤
DE-ENERGIZE
(CLOSE) STABILIZER
REFRIGERANT
SOLENOID VALVE (2 SOL)
NO
➤
➤
➤
YES
30 MIN.
CH WATER
PUMP TIMER
ELAPSED
➤
SHUTDOWN
CHILLED
WATER
PUMP
> 37°F
(2.8°C)
NO
YES
NO
➤
B
➤
56
➤
A
C
YORK INTERNATIONAL
➤
FORM 155.16-O3
A
C
B
➤
➤
CHECK STRONG
SOLUTION TEMP
@ RT 3
START
ALL PUMPS
➤
➤
YES
>136°F
(57.8°C)
STEAM
UNIT
NO
YES
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE DRAIN
VALVE
NO
➤
➤
➤
START 6-MINUTE
DILUTION CYCLE
TIMER
DISPLAY “DAY-TIME-LRTCHK FOR CRYSTALLIZATION”
AS STATUS
➤
➤
➤
➤
➤
SHUTDOWN
CHILLED
WATER
PUMP
YES
ENTER DILUTION
CYCLE @ 8
PAGE 35
30 MIN.
CHILL WATER
PUMP TIMER
ELAPSED
➤
NO
➤
EXIT DILUTION
CYCLE @ *
PAGE 42
➤
REFRIGTEMP
> 37°F
(2.8°C)
➤
NO
➤
➤
6 MIN.
DILUTION
TIMER
ELAPSED
UNIT
SW IN
STOP/
RESET
NO
NO
➤
REFRIG
TEMP
> 37°F
(2.8°C)
➤
NO
➤
YES
➤
YES
YES
YES
C
D
➤
B
➤
YORK INTERNATIONAL
➤
A
E
57
C
B
➤
➤
A
D
E
➤
➤
➤
OPERATOR
PRESS WARNING
RESET KEY IN
SERVICE
MODE
UNIT
SW IN
STOP/
RESET
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
NO
➤
NO
➤
YES
➤
YES
➤
STEAM
UNIT
NO
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
OPEN
SAFETY
STATUS
CONTACTS
TB4-42/43
YES
➤
➤
LOCAL
OR REMOTE
NO
START
YES
➤
➤
2
➤
➤
LOCAL
OR REMOTE
START
➤
DE-ENERGIZE
6 SOL TO
CLOSE STEAM
CONDENSATE
DRAIN VALVE
➤
PAGE 11
REFRIG.
TEMP
> 37°F
(2.8°C)
NO
NO
YES
➤
YES
➤
2
➤
PAGE 11
NO
UNIT
SW IN
STOP/
RESET
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
PAGE 11
58
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 21
23
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
YES
➤
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS EXCEPT
CHILLED WATER
➤
START 30 MINUTE
CHILLED WATER
PUMP TIMER
➤
➤
CHECK
REEFRIGERANT
TEMP @ RT 8
➤
➤
YES
30 MIN.
CH WATER
PUMP TIMER
ELAPSED
➤
SHUTDOWN
CHILLED
WATER
PUMP
NO
CHILL
WATER
FLOW SWITCH
CLOSED
YES
NO
➤
B
➤
YORK INTERNATIONAL
➤
A
C
59
➤
A
C
B
➤
➤
CHECK STRONG
SOLUTION TEMP
@ RT 3
START
ALL PUMPS
➤
➤
YES
>136°F
(57.8°C)
STEAM
UNIT
NO
YES
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE DRAIN
VALVE
NO
➤
➤
➤
START 6-MINUTE
DILUTION CYCLE
TIMER
DISPLAY “DAY-TIME-LRTCHK FOR CRYSTALLIZATION”
AS STATUS
➤
➤
➤
➤
➤
SHUTDOWN
CHILLED
WATER
PUMP
YES
ENTER DILUTION
CYCLE @ 8
PAGE 35
30 MIN.
CHILL WATER
PUMP TIMER
ELAPSED
➤
NO
➤
EXIT DILUTION
CYCLE @
*
PAGE 42
➤
UNIT
SW IN
STOP/
RESET
➤
NO
➤
YES
➤
YES
➤
NO
C
D
➤
B
YES
➤
60
➤
➤
NO
YES
➤
A
NO
UNIT
SW IN
STOP/
RESET
➤
OPERATOR
PRESS
WARNING RESET
KEY IN
SERVICE
MODE
6 MIN.
DILUTION
TIMER
ELAPSED
E
YORK INTERNATIONAL
A
C
B
D
E
➤
FORM 155.16-O3
➤
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
➤
➤
STEAM
UNIT
NO
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
OPEN
SAFETY
STATUS
CONTACTS
TB4-42/43
YES
➤
➤
DE-ENERGIZE
6 SOL TO
CLOSE STEAM
CONDENSATE
DRAIN VALVE
LOCAL
OR REMOTE
NO
START
YES
➤
➤
2
PAGE 11
LOCAL
OR REMOTE
START
➤
NO
➤
➤
YES
➤
2
➤
PAGE 11
NO
UNIT
SW IN
STOP/
RESET
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
61
PAGE 22
24
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
STRONG
SOLUTION
TEMP <336°F
(168.9°C)
UNIT
SW IN
STOP/
RESET
➤
YES
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
NO
LOCAL
OR REMOTE
START
PAGE 11
➤ 2
YES
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
62
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 22
25
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@
PAGE 42
*
➤
➤
HT1
MANUALLY
RESET
YES
UNIT
SW IN
STOP/
RESET
➤
OPEN STATUS
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
NO
PAGE 11
LOCAL
OR REMOTE
➤ 2
YES
START
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
YORK INTERNATIONAL
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
63
26 PAGE 23
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
PAGE 39
27
➤
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION CYCLE –
SHUTDOWN ALL PUMPS
➤
NO
➤
➤
➤
➤
EPROM
VERSION
A.02F.01 AND
LATER
➤
YES
UNIT
SW IN
STOP/
RESET
➤
YES
➤
➤
CHECK STRONG
SOLUTION TEMP
@ RT 3
NO
FLOAT
SW (2F)
CLOSED
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
YES
➤
➤
START ALL
PUMPS
➤
YES
>136°F
(57.7°C)
1
PAGE
11
NO
➤
➤
DISPLAY “DAY-TIME-MCFLCHK FOR CRYSTALLIZATION”
AS STATUS
STEAM
UNIT
YES
➤
ENERGIZE 6 SOL
TO OPEN STEAM
CONDENSATE DRAIN
VALVE
NO
➤
➤
➤
➤
NO
FLOAT
SW (2F)
CLOSED
START 6-MINUTE
DILUTION CYCLE
TIMER
YES
➤
➤
64
A
B
YORK INTERNATIONAL
FORM 155.16-O3
A
B
ENTER DILUTION
CYCLE @ 8
PAGE 35
➤
NO
➤
➤
➤
➤
UNIT
SW IN
STOP/
RESET
EXIT DILUTION
CYCLE @ *
PAGE 42
YES
➤
➤
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
OPERATOR
PRESS WARNING
RESET KEY IN
SERVICE
MODE
➤
NO
➤
NO
YES
YES
➤
➤
YES
UNIT
SW IN
STOP/
RESET
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
LOCAL
OR REMOTE
START
➤
NO
YES
➤
➤
2
PAGE 11
➤
1
PAGE 11
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
NO
➤
➤
➤
NO
UNIT SW
IN STOP/
RESET
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
YORK INTERNATIONAL
➤ 1
PAGE 11
65
PAGE 23
28
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
HIGH
PRESSURE
SAFETY (HP1)
TRIPPED
UNIT
SW IN
STOP/
RESET
➤
NO
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
YES
➤
➤
➤
NO
PAGE 11
LOCAL
OR REMOTE
➤ 2
YES
START
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
66
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 23
29
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
GENERATOR
PRESS (PT1)
>14.99 PSIA
(103.4 kPa)
➤
YES
UNIT
SW IN
STOP/
RESET
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
NO
LOCAL
OR REMOTE
START
PAGE 11
➤ 2
YES
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
YORK INTERNATIONAL
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
67
PAGE 30
30
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
PAGE 39
➤
31
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS
➤
➤
SOLUTION
PUMP
OVERLOAD
CLOSED
➤
NO
CHECK STRONG
SOLUTION TEMP
@ RT 3
YES
➤
➤
INCREMENT
SOLUTION PUMP
OVERLOAD
COUNTER
>136°F
(57.7°C)
➤
YES
NO
➤
➤
68
A
B
YORK INTERNATIONAL
FORM 155.16-O3
A
B
➤
PUMP
OVERLOAD
COUNTER
<2
➤
NO
➤
YES
➤
START ALL PUMPS
DISPLAY “DAY-TIMEPO-CHK FOR
CRYSTALLIZATION”
AS STATUS
➤
➤
YES
STEAM
UNIT
➤
NO
➤
➤
ENERGIZE 6 SOL TO
OPEN STEAM
CONDENSATE
DRAIN VALVE
SOLUTION
PUMP
OVERLOAD
CLOSED
NO
➤
YES
START 6 MINUTE
DILUTION CYCLE
TIMER
➤
➤
UNIT SW
IN STOP/
RESET
➤
NO
➤
YES
➤
➤
ENTER DILUTION
CYCLE @
8 PAGE 35
➤
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
YES
➤
EXIT DILUTION
CYCLE @
* PAGE 42
NO
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
YORK INTERNATIONAL
➤
A
B
PAGE 11
69
➤
A
B
➤
➤
➤
➤
NO
UNIT SW
IN STOP/
RESET
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
YES
➤
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
➤
➤
NO
LOCAL
OR REMOTE
START
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
YES
➤
➤
2
➤
PAGE 11
➤
UNIT SW
IN STOP/
RESET
NO
YES
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
1
PAGE 11
70
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 30
32
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
PAGE 40
➤
33
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS
➤
➤
REFRIG
PUMP
OVERLOAD
CLOSED
➤
NO
CHECK STRONG
SOLUTION TEMP
@ RT 3
YES
➤
➤
INCREMENT
REFRIGERANT PUMP
OVERLOAD
COUNTER
>136°F
(57.7°C)
➤
YES
NO
➤
➤
YORK INTERNATIONAL
A
B
71
A
B
➤
REFRIG
PUMP
OVERLOAD
COUNTER
<2
➤
NO
➤
YES
➤
START ALL PUMPS
DISPLAY “DAY-TIMEPO-CHK FOR
CRYSTALLIZATION”
AS STATUS
➤
➤
➤
YES
STEAM
UNIT
NO
➤
➤
ENERGIZE 6 SOL TO
OPEN STEAM
CONDENSATE
DRAIN VALVE
REFRIG
PUMP
OVERLOAD
CLOSED
NO
➤
YES
START 6 MINUTE
DILUTION CYCLE
TIMER
➤
➤
UNIT SW
IN STOP/
RESET
➤
NO
➤
YES
ENTER DILUTION
CYCLE @
8 PAGE 35
➤
➤
➤
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
YES
➤
EXIT DILUTION
CYCLE @
* PAGE 42
NO
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
72
➤
A
B
PAGE 11
YORK INTERNATIONAL
➤
FORM 155.16-O3
A
B
➤
➤
➤
➤
NO
UNIT SW
IN STOP/
RESET
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
YES
➤
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
➤
➤
NO
LOCAL
OR REMOTE
START
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
YES
➤
➤
2
➤
PAGE 11
➤
UNIT SW
IN STOP/
RESET
NO
YES
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
73
PAGE 30
34
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
PAGE 39
➤
35
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS
➤
➤
REFRIG
PUMP
OVERLOAD
CLOSED
➤
NO
CHECK STRONG
SOLUTION TEMP
@ RT 3
YES
➤
➤
INCREMENT
ABSORBER PUMP
OVERLOAD
COUNTER
>136°F
(57.7°C)
➤
YES
NO
➤
➤
74
A
B
YORK INTERNATIONAL
FORM 155.16-O3
A
B
➤
ABSORBER
PUMP
OVERLOAD
COUNTER
<2
➤
NO
➤
YES
➤
START ALL PUMPS
DISPLAY “DAY-TIMEPO-CHK FOR
CRYSTALLIZATION”
AS STATUS
➤
➤
STEAM
UNIT
➤
YES
NO
➤
➤
ENERGIZE 6 SOL TO
OPEN STEAM
CONDENSATE
DRAIN VALVE
ABSORBER
PUMP
OVERLOAD
CLOSED
NO
➤
YES
START 6 MINUTE
DILUTION CYCLE
TIMER
➤
➤
UNIT SW
IN STOP/
RESET
➤
NO
➤
YES
ENTER DILUTION
CYCLE @
8 PAGE 35
➤
➤
➤
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
EXIT DILUTION
CYCLE @
PAGE 42
YES
➤
*
NO
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
YORK INTERNATIONAL
➤
A
B
PAGE 11
75
➤
A
B
➤
➤
➤
➤
NO
UNIT SW
IN STOP/
RESET
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
YES
➤
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
➤
➤
NO
LOCAL
OR REMOTE
START
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
YES
➤
➤
2
➤
PAGE 11
➤
UNIT SW
IN STOP/
RESET
NO
YES
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
1
PAGE 11
76
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 30
36
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
PAGE 40 37
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE
6 SOL TO CLOSE
STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION
CYCLE – SHUTDOWN
ALL PUMPS
➤
➤
GENERATOR
PUMP
OVERLOAD
CLOSED
➤
NO
CHECK STRONG
SOLUTION TEMP
@ RT 3
YES
➤
➤
INCREMENT
GENERATOR PUMP
OVERLOAD
COUNTER
>136°F
(57.7°C)
YES
➤
NO
➤
➤
YORK INTERNATIONAL
A
B
77
A
B
➤
GENERATOR
PUMP
OVERLOAD
COUNTER
<2
➤
YES
➤
NO
➤
START ALL PUMPS
DISPLAY “DAY-TIMEPO-CHK FOR
CRYSTALLIZATION”
AS STATUS
➤
➤
➤
YES
STEAM
UNIT
NO
➤
➤
ENERGIZE 6 SOL TO
OPEN STEAM
CONDENSATE
DRAIN VALVE
GENERATOR
PUMP
OVERLOAD
CLOSED
NO
➤
YES
START 6 MINUTE
DILUTION CYCLE
TIMER
➤
➤
UNIT SW
IN STOP/
RESET
➤
NO
➤
YES
ENTER DILUTION
CYCLE @
8 PAGE 35
➤
➤
➤
OPERATOR
PRESS WARNING
RESET IN
SERVICE
MODE
YES
➤
EXIT DILUTION
CYCLE @
* PAGE 42
NO
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
78
➤
A
B
PAGE 11
YORK INTERNATIONAL
➤
FORM 155.16-O3
A
B
➤
➤
➤
➤
NO
UNIT SW
IN STOP/
RESET
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
YES
➤
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
TERMINATE
DILUTION –
SHUTDOWN
ALL PUMPS
➤
➤
NO
LOCAL
OR REMOTE
START
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
NO
YES
➤
➤
2
➤
PAGE 11
➤
UNIT SW
IN STOP/
RESET
NO
YES
➤
OPEN SAFETY
STATUS
CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
79
PAGE 31
38
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
JP5
IN
➤
NO
HOT
WATER
TEMP @ RT7
<269°F
(128.3°C)
NO
YES
YES
➤
➤
HOT
WATER
SUPPLY @ RT7
< 254°F
(123.3°C)
YES
➤
UNIT
SW IN
STOP/
RESET
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
LOCAL
OR REMOTE
START
NO
PAGE 11
➤ 2
YES
➤
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
80
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 31
39
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
JP5
IN
➤
NO
STEAM
TEMP @
RT7 < 339°F
(170.6°C)
NO
YES
YES
➤
➤
STEAM
SUPPLY
@ RT7 < 289°F
(142.8°C)
YES
➤
UNIT
SW IN
STOP/
RESET
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
LOCAL
OR REMOTE
START
NO
PAGE 11
➤ 2
YES
➤
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
YORK INTERNATIONAL
➤
DE-ENERGIZE 6 SOL TO
CLOSE STEAM
CONDENSATE DRAIN VALVE
81
PAGE 32
40
➤
CLOSE SAFETY STATUS
CONTACTS TB4-42/43
➤
DE-ENERGIZE 1R RELAY TO
CLOSE STEAM/HOT WATER
SHUTOFF VALVE
➤
START 6 MINUTE
DILUTION CYCLE TIMER
➤
➤
ENTER DILUTION CYCLE
@ 8 PAGE 35
➤
EXIT DILUTION CYCLE
@ * PAGE 42
➤
➤
STEAM
PRESS @ PT2
> 28.9 PSIA
(199.3 kPa)
➤
YES
UNIT
SW IN
STOP/
RESET
OPEN SAFETY
➤ STATUS CONTACTS
YES
TB4-42/43
NO
NO
➤
➤
➤
NO
LOCAL
OR REMOTE
START
PAGE 11
➤ 2
YES
➤
NO
6 MIN.
DILUTION
TIMER
ELAPSED
YES
➤
TERMINATE DILUTION –
SHUTDOWN ALL PUMPS
➤
STEAM
UNIT
82
➤
DE-ENERGIZE 6 SOL TO CLOSE
STEAM CONDENSATE DRAIN VALVE
➤
NO
YES
YORK INTERNATIONAL
FORM 155.16-O3
41 PAGE 35
➤
➤
POWER
RESTORED
NO
YES
➤
DISPLAY 10-SECOND
LOCKOUT DELAY
COUNTDOWN TIMER
➤
CHECK STRONG
SOLUTION TEMP @ RT 3
➤
<136°F
(57.7°C)
YES
➤
SAFETY SHUTDOWN – DISPLAY
“DAY-TIME--PF-CHK FOR
CRYSTALLIZATION”
AS STATUS
NO
➤
➤
➤
CYCLING SHUTDOWN – DISPLAY
“DAY-TIME-POWER FAILURE –
AUTOSTART” AS STATUS
YES
J50
IN
“AUTOSTART”
CLOSE SAFETY SHUTDOWN
STATUS CONTACTS
TB4-42 & 43
➤
➤
NO
➤
CLOSE CYCING
SHUTDOWN STATUS
CONTACTS TB4-40/41
OPERATOR
PRESS UNIT
SW TO STOP/
RESET
➤
NO
➤
➤
10-SECOND
LOCKOUT
TIMER
ELAPSED
NO
YES
➤
➤
SAFETY SHUTDOWN
DISPLAY “DAY-TIMEPOWER FAILURE –
MANUAL RESTART”
AS STATUS
OPERATOR
PRESS WARNING
RESET KEY IN
SERVICE
MODE
NO
YES
➤
OPEN CYCLING
SHUTDOWN
STATUS CONTACTS
TB4-40/41
➤
YES
OPEN SAFETY
SHUTDOWN STATUS
CONTACTS TB4-42/43
➤
➤
2
YORK INTERNATIONAL
➤
PAGE 11
A
1
PAGE 11
83
A
➤
CLOSE SAFETY SHUTDOWN
STATUS CONTACTS TB4-42/43
➤
➤
10-SECOND
LOCKOUT
TIMER
ELAPSED
NO
YES
➤
START 6-MINUTE
DILUTION CYCLE TIMER
➤
STEAM
UNIT
➤
YES
ENERGIZE STEAM
CONDENSATE DRAIN
VALVE (6 SOL)
NO
➤
➤
➤
ENTER DILUTION
CYCLE @
8 PAGE 35
➤
EXIT DILUTION
CYCLE @
PAGE 42
*
➤
NO
UNIT
SW IN STOP/
RESET
NO
➤
YES
YES
A
➤
➤
84
➤
➤
6 MIN.
DILUTION
TIMER
ELAPSED
B
C
YORK INTERNATIONAL
A
➤
TERMINATE
DILUTION –
SHUTDOWN ALL
PUMPS
OPEN SAFETY
SHUTDOWN STATUS
CONTACTS
TB4-42/43
➤
➤
YES
➤
➤
DE-ENERGIZE 6 SOL
TO CLOSE STEAM
CONDENSATE
DRAIN VALVE
C
B
STEAM
UNIT
LOCAL
OR REMOTE
START
➤
FORM 155.16-O3
NO
YES
NO
➤
2
➤
PAGE 11
➤
➤
UNIT
SW IN
STOP/
RESET
NO
YES
➤
OPEN SAFETY
SHUTDOWN STATUS
CONTACTS
TB4-42/43
➤
1
PAGE 11
YORK INTERNATIONAL
85
PAGE 14, 26
42
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL TO
CLOSE STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION –
SHUTDOWN ALL PUMPS
➤
➤
UNIT
SW IN
STOP/
RESET
NO
YES
➤
OPEN SAFETY
STATUS CONTACTS
TB4-42/43
➤
1
PAGE 11
86
YORK INTERNATIONAL
FORM 155.16-O3
PAGE 14
43
➤
CLOSE SAFETY
STATUS CONTACTS
TB4-42/43
➤
DE-ENERGIZE 1R
RELAY TO CLOSE
STEAM/HOT WATER
SHUTOFF VALVE
➤
STEAM
UNIT
➤
YES
DE-ENERGIZE 6 SOL TO
CLOSE STEAM CONDENSATE
DRAIN VALVE
NO
➤
➤
BYPASS DILUTION –
SHUTDOWN ALL PUMPS
➤
➤
UNIT
SW IN
STOP/
RESET
NO
YES
➤
➤
FLOAT
SWITCH
CONFLICT RE- NO
MOVED
YES
➤
OPEN SAFETY STATUS
CONTACTS TB4-42/43
➤
1
YORK INTERNATIONAL
PAGE 11
87
CONTROL CENTER
28342A(D)
FIG. 1 – MICROCOMPUTER CONTROL CENTER KEYPAD
The Control Center front panel layout consists of five
key groups, one switch, and a I-line by 40-character alpha numeric vacuum fluorescent display (see Fig. 1).
Character Display – The alphanumeric vacuum fluorescent display is located to the right of the STATUS key.
All messages, parameters, setpoints, and data can be
viewed at this location. The main communications between the operator or service technician and the Control Center occur on this display.
Display – Provide a direct readout of each monitored
parameter on the alphanumeric display.
Entry – These keys are used to enter the values for
this operator programmed setpoints. These keys are used
in conjunction with the Setpoint keys while in PROGRAM mode.
Setpoints – These keys are used as follows:
GRAM mode, where the operator can change Setpoints
or OPERATING modes (LOCAL, REMOTE, or SERVICE). This access code provides security. It prevents
tampering by an authorized personnel.
PROGRAM – Permits the operator to change setpoints
and operating modes (LOCAL, REMOTE, SERVICE).
MODE – Permits operator to check what mode the
Control Center is presently in. Also, used with the PROGRAM key to change operating modes. The modes are
as follows:
1. LOCAL – Allows manual unit start from the UNIT
rocker switch on the front panel. Also allows certain
cycling inputs from remote devices to start and stop
unit.
2. REMOTE – Allows remote start and stop of unit. Also
allows remote reset of leaving water temperature
(chilled or hot) and remote load limit setpoints.
1. To view each setpoint, in any mode or
2. To select the individual setpoints that are programmed
by the operator in PROGRAM mode only.
3. SERVICE – Allows manual control of burner or steam
valve and pumps. Allows use of the WARNING RESET key.
Pressing the appropriate key enables the operator to
program that setpoint by pressing the Entry keys.
4. PROGRAM – Allows operator to change modes and
program setpoints.
ACCESS CODE – This key, along with the Entry keys,
is used to enter the 4-digit access code. Entry of the
correct access code allows the operator access to PRO-
UNIT SWITCH – This 3-position rocker switch is used
for START, RUN, STOP-RESET functions. This switch
cannot be used to start the unit in REMOTE mode.
88
YORK INTERNATIONAL
FORM 155.16-O3
OPERATION
DISPLAYING SYSTEM PARAMETERS
The Display keys are used to display selected monitored parameters as follows (refer to Fig. 1):
• Press and release the appropriate Display key – the
message will be displayed for 2 seconds.
– or –
• Press and hold the appropriate Display key – the
message will be displayed and updated every 0.5
seconds until the Display key is released.
– or –
• Press and release appropriate Display key, then press
and release the DISPLAY HOLD key – the message
will be displayed and updated every 2 seconds until
the DISPLAY HOLD key is again pressed and released, or 10 minutes have elapsed, whichever occurs first.
– or –
• For those Display keys that display more than one
message, press and hold the DISPLAY key. Each
message will be displayed for 2 seconds and automatically scroll to the message as long as the key is
pressed. To hold a specific message, press and release the DISPLAY HOLD key, then immediately
press and release the desired Display key. The first
message will be displayed and updated every 2 seconds until the DISPLAY key is again pressed and released. Then the second message is displayed. Each
time the DISPLAY key is pressed and released, the
next message is displayed. This can be continued until
the DISPLAY HOLD key is pressed and released or
10 minutes have elapsed, whichever occurs first.
(When pressing the PUMP STATUS key in SERVICE
mode, the “Display Hold” feature is automatically engaged. This facilitates manual pump and manual dilution cycle operation.)
NOTE: X’s will not be displayed for parameter values.
They are shown below to depict number fields
only. If a parameter is out of range, the highest
or lowest allowable number is displayed, but the
“=” sign is replaced by a greater than (“ > ”) or
less than (“ > ”) sign, whichever is appropriate.
Refer to Fig. 2 for the range of each parameter.
If the Micro Board program jumper J52 (English/
Metric) is installed, all temperatures are displayed in °F and all pressures are displayed in
PSIA. If the jumper is removed, all temperatures
are displayed in °C and all pressures are displayed in kPa. If the I/O Expansion Board program jumper J12 is installed, all messages displayed in English language. If removed, all messages displayed in German language.
YORK INTERNATIONAL
PARAMETER
RANGE
Leaving Chilled Water Temp
0.0 - 81.0°F
(–17.8 - 27.2°C)
0.0 - 93.0°F
(–17.8 - 33.9°C)
8.4 - 134.0°F
(–13.1 - 56.7°C)
0.00 -15.00 PSIA
(0 - 103.4 kPa)
100.0 - 220.0°F
(37.8 - 104.4°C)
0.0 - 134.0°F
(–17.8 - 56.7°C)
91.0 - 346.0°F
(32.8 - 174.4°C)
8.4 - 134.0°F
(–13.1 - 56.7°C)
8.4 - 134.0°F
(–13.1 - 56.7°C)
91.0 - 346.0°F
(32.8 - 174.4°C)
10.0 - 40.0 PSIA
(68.9 - 275.8 kPa)
40% - 70%
Return Chilled Water Temp
Refrigerant Temp Leaving the Cond.
Generator Shell Pressure
Automatic Decrystallization Temp
Refrigerant Temp
Strong Solution Temp
Leaving Condenser Water Temp
Return Condenser Water Temp
Steam or Hot Water Supply Temp
Steam Supply Pressure1
Solution Concentration2
NOTES:
1. Steam units only
2. Units equipped with EPROM version A.02F.02 (or later)
FIG. 2 – SYSTEM PARAMETER RANGES
To display CHILLED WATER TEMPERATURES:
Use the CHILLED WATER TEMPS display key as described above to produce the following display message:
CHILLED LEAVING = XXX.X°F, RETURN = XXX.X°F
To display SUPPLY STEAM PRESSURE AND TEMPERATURE: (Steam units only).
Use the SUPPLY STEAM PRESS/TEMP key as described above to produce the following message:
STEAM TEMP = XXX.X°F, PRESS = XX.XX PSIA
To display REFRIGERANT AND STRONG SOLUTION
TEMPERATURES and REFRIGERANT TEMPERATURES LEAVING THE CONDENSER, use the REFRIGERANT/SOL’N TEMPS key as follows:
Use the REFRIGERANT/SOL’N TEMPS key as described above to produce the following messages:
REFRIG = XXX.X°F; STRONG SOLN = XXX.X°F
REFRIGERANT TEMP LEAVING THE CONDENSER = XXX.X°F
89
SOLUTION CONCENTRATION = XX.X%
*
*Units equipped with EPROM version A.02F.02 (or later)
To initiate a PRINT to the printer: (Refer to the Instruction, Form 155.16-NO1.2 for details of the optional
printers.)
To display OPTIONS:
The OPTIONS key is used to display any options that
are installed. It is also used for the LiBr concentration
calculator in PROGRAM MODE (refer to page 91 of this
book). If the key is pressed in SERVICE, LOCAL, or
REMOTE MODE,
NO OPTIONS INSTALLED
is displayed.
To display operating status of SYSTEM PUMPS,
MANUAL DILUTION CYCLE and STABILIZER SOLENOID VALVE:
Press the PRINT key:
If the printer is not connected to the Micro Board or if
one is connected but not turned on,
PRINTER NOT ON OR CONNECTED
is displayed.
If a printer is connected to the Micro Board and turned
on,
PRINT ENABLED is displayed and a printout is initiated.
If a print is already in progress when the PRINT key is
pressed, PRINT REQUEST IN PROGRESS is displayed.
Use the PUMP STATUS key as described above to produce the following messages:
To display the SUPPLY HOT WATER TEMPERATURE:
(HOT WATER UNITS ONLY)
PURGE PUMP – OFF
REFRIGERANT PUMP – ON
SOLUTION PUMP – ON
(Note 1)
Use the SUPPLY HOT WATER TEMP display key as
above to produce the following message:
HOT WATER TEMP = XXX.X°F
ABSORBER PUMP – ON
(Note 1)
CHILLED WATER PUMP – ON
To display OPERATING HOURS and STARTS COUNT:
CONDENSER PUMP – ON
GENERATOR PUMP – ON
(Note 1)
MANUAL DILUTION CYCLE – OFF
Use the OPERATING HRS/START COUNTER display
key as described above to produce the following message:
OPER HOURS = XXXXX; START COUNTER = XXXXX
STABILIZER REF SOLENOID VALVE – CLOSED
The PUMP STATUS key is also used in conjunction with
the MANUAL PUMP key to control the system pumps,
perform a manual dilution cycle and control the stabilizer refrigerant solenoid valve. Refer to “Service Keys”
section for details.
NOTE: On the 50 Hz Models YIA-10E3 – YIA-14F3 with
Franklin pumps, (Micro Board jumper JP3 is out),
the solution pump is replaced by an absorber
pump and generator pump.
To display CONDENSER WATER TEMPERATURES:
Use the CONDENSER WATER TEMPS key as described
above to produce the following message:
COND LEAVING = XXX.X°F; RETURN = XXX.X°F
90
NOTE: When the Micro Board or Real Time Clock (RTC)
chip (IC U16 on Micro Board) is replaced, these
values will be lost. Prior to removing the defective component, the service technician should
log these values. After the new component is
installed, these values should be entered using
the “Special Programming Procedure” in the Service manual, Form 155.16-M3. These values can
also be reset to zero using the “Special Programming Procedures”.
To display the number of purge cycles that have occurred
over the LAST 7 DAYS and TOTAL purge cycles over
the LIFETIME of the unit:
Use the PURGE CYCLE COUNTER display key as described above to produce the following message:
YORK INTERNATIONAL
FORM 155.16-O3
LAST 7 DAYS = XXX; TOTAL PURGES = XXXXX
Total purges in
last 7 days
Total purges to date
over lifetime of unit
LiBr CONCENTRATION CALCULATOR
The concentration calculator allows the service technician to determine the concentration of any lithium bromide solution without referring to the traditional “PTX”
chart. By entering a SOLUTION TEMPERATURE and
REFRIGERANT SATURATION TEMPERATURE or
PRESSURE (PSIA), the CONCENTRATION is automatically calculated. To use the calculator, proceed as follows:
1. Refer to “Programming the IsoFlow Control Center”
section of this book and gain access to PROGRAM
MODE by performing steps 1 thru 8.
PROGRAM MODE, SELECT SETPOINT is displayed.
The user will have access to the calculator for 10 minutes. When 10 minutes have elapsed, access to PROGRAM mode will be automatically disabled. The user
will have to repeat this step to regain access to PROGRAM mode.
2. Press OPTIONS key.
WELCOME TO LIBR CONCENTRATION CALCULATOR
is displayed.
3. Press OPTIONS key.
BROMIDE SOLUTION TEMP = 0.0°F
is displayed.
4. Using the Entry keys, enter a solution temperature.
Use leading zeroes where necessary (i.e.,
095.0°F).The CANCEL key can be used at any time
to cancel any entry.
5. Press ENTER key.
6. Press ADVANCE DAY/SCROLL key.
SATURATION TEMP = 0.0°F; PRS = 0.00 PSIA
is displayed.
7. The user has a choice of entering either a refrigerant
saturation temperature or pressure. Whichever one
is entered, the program automatically calculates and
displays the other. Based upon your choice, use either procedure A. or B. below:
A. To enter the temperature, use the Entry keys (use
leading zeroes where necessary; i.e., 095.0°F).
Press the ENTER key. The corresponding pressure is displayed.
YORK INTERNATIONAL
– or –
B. To enter the pressure, press the * (asterisk) key.
The cursor is moved to the first changeable digit of
the pressure entry and “???.?” is displayed for
the temperature value. Using the Entry keys, enter the pressure value (use leading zeroes where
necessary; i.e., 0.35 PSIA). Press the ENTER key.
The corresponding temperature is displayed.
8. Press ADVANCE DAY/SCROLL key.
SOLUTION CONCENTRATION = XX.X%
is displayed.
9. If it is desired to view the entries that were just made,
press the ADVANCE DAY/SCROLL key repeatedly.
– or –
If it is desired to perform further concentration calculations for the remainder of the 10 minute period, press
the ADVANCE DAY/SCROLL key to go back to the
beginning.
– or –
If it is desired to exit the calculator routine, press the
PROGRAM key.
SYSTEM SETPOINTS
The system setpoints may be programmed by the system operator. The Setpoints keys are located on the
Control Center keypad (see Fig. 1). To program, see “Programming System Setpoints”, page 94. The following is
a description of these setpoints.
LEAVING WATER TEMP – This setpoint determines the
leaving chilled water temperature that the unit will maintain. The range is 40-77°F. The default value is 44°F.
However, each unit has a minimum allowable setpoint
that is determined by the design of that unit. The value is
programmed into the Control Center at the York factory
and must never be changed. The software will prevent
operator personnel from entering a value that is lower
than the factory programmed value.
OUT OF RANGE – TRY AGAIN is displayed if an attempt
is made to enter a lower value. If the Micro Board or
Real Time Clock Chip (IC U16 on Micro Board) is replaced, this minimum allowed value must be entered by
a qualified service technician.
An “Energy Management System” (EMS) can be connected to the Control Center to change this setpoint from
a remote location while the Control Center is operating
in REMOTE mode. Refer to “Field Control Modifications
Diagram”, Form 155.16-PA3 for details of Remote Setpoint Reset Operation.
PURGE PUMP SERVICE INTERVAL – This setpoint
91
provides a purge pump service reminder. When the cumulative purge pump operating hours since last service
equals the programmed service interval,
WARNING – PURGE PUMP SERVICE RECOMMENDED is displayed on the keypad display. The service interval is programmable from 5-100 hours. The default value is 10
hours. Pressing the SETPOINT key displays the programmed service interval and accumulated pump operating hours since last service. After servicing the pump,
pressing the WARNING RESET key in SERVICE MODE
clears the warning message and resets the cumulative
operating hours to zero. Moving Micro Board program
jumper J57 from “CLKOFF” to “CLKON” position, as
would be done during unit commissioning, also resets
the cumulative operating hours to zero.
PULL DOWN DEMAND – This function is used to provide energy savings by limiting fuel or steam consumption during the first 1 to 255 minutes (programmable) of
unit operation following a unit start. Instead of allowing
the load command to rapidly increase to 100%, due to
the typical high load conditions at start, the hot water
valve (hot water unit) or steam valve position (steam
units) is restricted to ramping up from a maximum allowed starting load limit to a maximum allowed Stop load
limit over the pull down interval.
The programmable range is 20 to 100%. The pull down
interval is programmable from 1 to 255 minutes. Each
time the unit starts, a timer begins counting down the
pull down interval. Unit loading/unloading is controlled
by the automatic temperature control algorithm. However, during the pull down interval, it cannot load to a
value greater than the pull down demand limit will allow.
The limit ramps linearly from the programmed START
limit to the programmed STOP limit over programmed
INTERVAL (SETP). The START limit is effective when
the unit starts. The STOP limit is effective when the INTERVAL timer has elapsed. The limit at any time in between these points can be determined by:
T
(STOP LIMIT - START LIMIT) ELAPSED + START LIMIT = % LOAD LIMIT
T
INTERVAL
While the unit is operating and the pull down interval
has not yet expired, the present load limit and time remaining in the interval can be viewed by pressing the
PULL DOWN DEMAND setpoint key.
PRESENT PULL DOWN LIMIT = XX%; XXX MIN LEFT
is displayed. After the interval has elapsed, pressing this
key displays the programmed interval, start load limit
and stop load limit as follows:
SETP = XXX MIN; START = XX%; STOP = XX%
Any time the interval is in effect and the unit is being
prevented from further loading,
SYSTEM RUN – PULL DOWN LIMIT
is displayed. After
92
timeout, the pull down limit is no longer in effect. The
following illustrates the load limiting characteristics of a
pull down demand programmed as follows:
SETP = 60 MIN: START = 40%: STOP = 100%
Each time the unit is started, the load is linearly limited
from 40 to 100% for the first 60 minutes of unit operation
as follows:
LOAD LIMIT
100%
90%
80%
70%
60%
50%
40%
30%
20%
0
10
20
30
40
50
60
70
80
255
TIME (minutes)
Using the above formula, the load limit at any time during the 60-minute interval can be determined. For example, the load limit 20 minutes after unit has started
will be:
(100 - 40) 20
+ 40 = 60
60
CLOCK – The Control Center contains an internal clock
that is an inherent part of the Micro Board. It provides
the day of the week, time of day, and calendar date. If
not programmed, the default value is
SUNDAY 12:00 AM 1/1/92
DAILY SCHEDULE – The Control Center can be programmed to automatically start and stop the chiller as
desired. This schedule will repeat on a seven-day calendar basis. If the Daily Schedule is not programmed, the
default value is 00:00 AM start and stop times for all
days of the week and the holiday. (Note that the system
will not automatically start and stop on a daily basis with
these default values is 00:00 is an “Impossible” time for
the Micro Board. See “Programming System Setpoints”,
page 94). Finally one or more days in the week can be
designated as holidays (see description under HOLIDAY setpoint) and the Control Center can be programmed (using DAILY SCHEDULE setpoint) to automatically start and stop the chiller on those days so designated. The operator can override the time clock at any
time using the UNIT switch in LOCAL mode.
Note that if only a start time is entered for a particular
YORK INTERNATIONAL
FORM 155.16-O3
day, the compressor will not automatically stop until a
scheduled time is encountered on a subsequent day.
HOLIDAY – One or more of the days of the week can
be designated as holidays. (See description of DAILY
SCHEDULE above.) On those designated days, the
chiller will automatically start and stop per the HOLIDAY start and stop times programmed in the DAILY
SCHEDULE setpoint. It will do this one time only and
the following week will revert to the normal daily schedule for that day.
REMOTE RESET TEMP RANGE – This is the maximum allowable offset of the leaving chilled water setpoint
when operating in REMOTE mode. This offset is either
10°F or 20°F as programmed. If not programmed, the
default value is 20°F.
is again pressed and released, or 10 minutes have
elapsed, whichever comes first.
NOTE: X’s will not be displayed for setpoint values. They
are shown to depict number fields only. If Micro
Board program jumper J52 (English/Metric) is
removed, temperatures are displayed in °C. If
I/O Expansion Board program jumper J12 is
removed, all messages displayed in German
language.
To display LEAVING WATER TEMP setpoint:
Use the LEAVING WATER TEMP setpoint key as described above to produce the following message:
LEAVING CHILLED WATER SETPOINT = XX.X°F
This value is added to the operator-programmed “Leaving Chilled Water Setpoint” (base) and the sum equals
the temperature range in which the setpoint can be reset. For example, if the operator has programmed a
setpoint for 46°F (base) into the Control Center, and the
REMOTE RESET TEMP RANGE is programmed to be
10°F, then an energy management system can remotely
reset the setpoint over the range of 46°F to 56°F (46 +
10 = 56).
NOTE: The value displayed in LOCAL or SERVICE
modes is that which was programmed by the
operator. The value displayed in REMOTE mode
is the sum of the operator-programmed value
(base) plus any offset (0-10°F or 0-20°F as programmed with “REMOTE RESET TEMP
RANGE KEY”) by a Remote Energy Management System.
Refer to “Field Control Modifications Diagram”, Form
155.16-PA3 for details of Remote Setpoint Reset Operation.
To display PURGE PUMP SERVICE INTERVAL setpoint:
DATA LOGGER – An optional printer can be connected
to the MicroComputer Control Center for data logging
purposes. Refer to “System Status Printers” Form for
details.
Use the PURGE PUMP SERVICE INTERVAL setpoint
key as described above to produce the following message:
PURGE SERVICE: INT = XXX HRS RUN TIME = XXX HRS
DISPLAYING SYSTEM SETPOINTS
To display PULL DOWN DEMAND setpoint:
• The currently programmed Setpoint values can be
viewed at any time in SERVICE, LOCAL, or REMOTE
operating mode as follows: Press and release the
appropriate Setpoint key – the message will be displayed for 2 seconds.
Use PULL DOWN DEMAND setpoint key as described
above to produce the following message:
– or –
• Press and hold the appropriate Setpoint key – the
message will be displayed as long as the key is
pressed.
– or –
• Press and release the appropriate Setpoint key, then
press and release the DISPLAY HOLD key. The message will be displayed until the DISPLAY HOLD key
YORK INTERNATIONAL
SETP = XXX MIN: START = XX% STOP = XX%
NOTE: If unit is operating and a pull down interval is in
effect, the following is displayed:
PRESENT PULL DOWN LIMIT = XX%; XXX MIN LEFT
To display CLOCK setpoint (time of day):
Use the CLOCK setpoint key as described above to produce the following message: TODAY IS XX:XX AM/PM 1/1/92
93
– or –
REMOTE RESET TEMP RANGE = 20°F
To display DAILY SCHEDULE setpoints:
• Press and hold the DAILY SCHEDULE setpoint key.
The chiller start and stop times for each day of the
week are sequentially displayed, beginning with
Sunday and ending with Holiday. The display will continuously scroll until the DAILY SCHEDULE key is
released.
To display DATA LOGGER setpoints:
Refer to YORK, Form 155.16-NO1.2 for operation of this
key.
– or –
• Press and release the DAILY SCHEDULE setpoint
key. Then press and release the DISPLAY HOLD key.
The chiller start and stop times for each day of the
week are sequentially displayed beginning with Sunday and ending with Holiday. The display will continuously scroll until the DISPLAY HOLD key is again
pressed and released or 10 minutes have elapsed,
whichever comes first.
To display message from DAILY SCHEDULE will scroll
in the following sequence:
PROGRAMMING THE ISOFLOW CONTROL
CENTER
PROGRAMMING SYSTEM SETPOINTS
The system setpoints can be entered at any time . . .
even when the system is running. Proceed as follows to
enter system setpoints (refer to Fig. 3).
1. Press ACCESS CODE key.
2.
ENTER VALID ACCESS CODE
is displayed.
SUN START = 08:30 AM STOP = 06:00 PM
3. Using Entry keys, enter 9 6 7 5.
MON START = 05:00 AM STOP = 07:00 PM
TUE START = 05:00 AM STOP = 07:00 PM
WED START = 05:00 AM STOP = 07:00 PM
THU START = 05:00 AM STOP = 07:00 PM
FRI START = 05:00 AM STOP = 07:00 PM
SAT START = 05:00 AM STOP = 07:00 PM
HOL START = 00:00 AM STOP = 00:00 PM
To display HOLIDAY setpoints:
Use the HOLIDAY setpoint key as described in the beginning of this section to produce the following message:
4. As each digit is entered, the characters Y O R K are
displayed.
NOTE: If digits other than 9 6 7 5 are entered, Y O R K
is still displayed.
NOTE: For ease in remembering the code, note that
the letters Y O R K correspond to the digits
9 6 7 5 on a telephone dial.
5. Press ENTER key.
NOTE: If digits other than 9 6 7 5 were entered in Step
No. 4.
INVALID ACCESS CODE is displayed when the
ENTER key is pressed. If this occurs, enter the
correct access code (9675) and proceed.
S M T W T F S HOLIDAY NOTED BY *
6.
NOTE: On the days that are designated by *, the chiller
will automatically start and stop per the holiday
schedule established in DAILY SCHEDULE
setpoints.
To display REMOTE RESET TEMP RANGE setpoint:
Use the REMOTE RESET TEMP RANGE setpoint key
as described above to produce the following message:
REMOTE RESET TEMP RANGE = 10°F
94
ACCESS TO PROGRAM KEY AUTHORIZED
is displayed.
NOTE: Unless terminated by pressing the ACCESS
CODE key again, the operator will have access
to the PROGRAM key for 10 minutes. When 10
minutes have elapsed, access to the program
key will be automatically disabled and the operator must return to Step No. 1 to gain access.
7. Press PROGRAM key.
8.
PROGRAM MODE, SELECT SETPOINT
is displayed.
YORK INTERNATIONAL
FORM 155.16-O3
5,9
2
2,4,6,8
3
1
9
3
1,10
7
28342A(D)
FIG. 3 – KEYPAD – PROGRAMMING SYSTEM SETPOINTS
9. Enter setpoints as detailed below. If you make a
mistake when entering a value, press CANCEL key
and then ENTER key. The display will revert to the
default values and the cursor will return to the first
changeable digit. You can then proceed to enter the
correct values. If the entered value exceeds acceptable limits, OUT OF RANGE – TRY AGAIN will be
displayed for 2 seconds, then the
PROGRAM MODE, SELECT SETPOINT message will
reappear.
10. When all desired setpoints have been entered, press
the ACCESS CODE key to exit the PROGRAM mode
and terminate access to PROGRAM mode.
ACCESS TO PROGRAM MODE DISABLED is displayed.
The Control Center will automatically return to LOCAL, REMOTE, or SERVICE mode . . . whichever
was last selected.
28342A(D)
FIG. 4 – KEYPAD – PROGRAMMING “LEAVING
CHILLED WATER TEMP” SETPOINT
2
3
1
28342A(D)
FIG. 5 – KEYPAD – PROGRAMMING “PURGE
PUMP SERVICE INTERVAL” SETPOINT
To enter LEAVING WATER TEMP setpoint:
1. Press and release the LEAVING WATER TEMP
setpoint key. The following program prompt message
will be displayed:
LVG CHILLED WATER SETPOINT = XX.X°F (BASE)
(BASE) refers to the base or lowest setpoint available to an Energy Management System. Refer to previous explanation of REMOTE/RESET TEMP
RANGE, page 93.
2. Use the Entry keys to enter desired value.
3. Press and release the ENTER key.
PROGRAM MODE, SELECT SETPOINT
message is displayed.
YORK INTERNATIONAL
To enter PURGE PUMP SERVICE INTERVAL setpoint.
(Refer to Fig. 5.):
1. Press and release the PURGE PUMP SERVICE INTERVAL key. The following program prompt message
will be displayed:
PURGE SERVICE INTERVAL: XXX HOURS
2. Use the Entry keys to enter desired value. Use leading zeros when necessary. (i.e., 006)
3. Press and release the ENTER key.
PROGRAM MODE, SELECT SETPOINT
message is displayed.
95
2
4,6
3
7
1
5
28342A(D)
28342A(D)
3
2
FIG. 6 – KEYPAD – PROGRAMMING “PULL DOWN
DEMAND” SETPOINT
FIG. 7 – KEYPAD – PROGRAMMING “CLOCK” SETPOINT
To enter PULL DOWN DEMAND setpoint. (Refer to Fig.
6.):
7. Press and release the ENTER key.
1. Press and release the PULL DOWN DEMAND
setpoint key. The following program prompt message
will be displayed:
SETP = XXX; START = XX%; STOP = XXX%
2. Use the Entry keys to enter desired value. Use leading zeros when necessary.
3. Press and release the ENTER key.
PROGRAM MODE, SELECT SETPOINT
is displayed.
To enter CLOCK setpoint. (Refer to Fig. 7.):
1. Assure Micro Board program jumper J57 is in
“CLKON” position.
2. Press and release the CLOCK setpoint key. The following program prompt message is displayed:
TODAY IS MON 10:30 AM 1/1/94
3. Press the ADVANCE DAY/SCROLL key until the
proper day of the week appears on the display.
4. Use the Entry keys to enter proper time of day.
5. Press the AM/PM key to change the AM to PM or
vice versa.
6. Use the Entry keys to enter proper calendar date
(MONTH/DAY/YR). If month and day are single digit
entries, precede the entry with “0”.
For example 02/04/93.
96
PROGRAM MODE, SELECT SETPOINT
message is dis-
played.
To enter DAILY SCHEDULE setpoint. (Refer to Fig. 8.)
1. Press and release the DAILY SCHEDULE setpoint
key. The following program prompt message is displayed:
SUN START = XX:XX AM, STOP = XX:XX AM
2. If the displayed start and stop time is not the desired
schedule, enter the desired start and stop times as
follows:
a. If you do not want the chiller to automatically start
and stop on this day, press the CANCEL key.
b. Use the Entry keys to enter desired hours and
minutes start time.
c. If necessary, press the AM/PM key to change “AM”
to “PM” or vice versa.
d. Use the Entry keys to enter desired hours and
minutes start time.
e. If necessary, press the AM/PM key to change “AM”
to “PM” or vice versa.
3. Press the ADVANCE DAY/SCROLL key. The following prompt message is displayed:
MON START = XX:XX AM, STOP = XX.XX AM
4. Enter the desired start and stop time per Step 2.
YORK INTERNATIONAL
FORM 155.16-O3
1
7
2
4
28342A(D)
3,5,6
3
2
1
28342A(D)
FIG. 8 – KEYPAD – PROGRAMMING “DAILY
SCHEDULE” SETPOINT
FIG. 9 – KEYPAD – PROGRAMMING “HOLIDAY”
SETPOINT
5. Press the ADVANCE DAY/SCROLL key. The following prompt message is displayed.
4. After you have placed an “*” next to each of the days
that you wish to designate a holiday, press the ENTER key
PROGRAM MODE, SELECT SETPOINT
message is displayed.
REPEAT MON SCHEDULE MON-FRI? YES=1, NO=2
a. If you press the “1” Entry key, Monday’s start and
stop time will be automatically entered for Tuesday
through Friday.
– or –
b. If you press the “0” Entry key, Tuesday through
Friday can be programmed with different start and
stop times.
6. Use the ADVANCE DAY/SCROLL key with procedure in Step 2. To enter start and stop times for remained of the week plus a holiday schedule is required.
7. Press and release the ENTER key.
PROGRAM MODE, SELECT SETPOINT
is displayed.
To enter HOLIDAY setpoint. (Refer to Fig. 9.):
To cancel all of the designated holidays: perform Step
1, press the CANCEL key, and then press the ENTER key. The PROGRAM MODE, SELECT SETPOINT message is displayed.
To cancel one of the designated holidays: perform
Step 1, press ADVANCE DAY/SCROLL key until the
cursor appears to the right of the desired day, press
the “*” key, then press the ENTER key.
To enter REMOTE/RESET TEMP RANGE setpoint. (Refer to Fig. 10.):
1. Press and release the REMOTE/RESET TEMP
RANGE setpoint key. The following program prompt
message is displayed:
REMOTE/RESET TEMP RANGE = XX°F
1. Press and release the HOLIDAY setpoint key. The
following program prompt message is displayed:
2. Use the Entry keys to enter desired value (10 or 20).
S M T W T F S HOLIDAY NOTED BY *
3. Press and release the ENTER key.
2. Press and release the ADVANCE DAY/SCROLL key
to move cursor to the day that you wish to designate
as a holiday.
PROGRAM MODE, SELECT SETPOINT
message is dis-
played.
3. Press the “*” key. An “*” will appear next to the selected day.
YORK INTERNATIONAL
97
3
2
UNIT KEYS
1
28342A(D)
FIG. 10 – KEYPAD – PROGRAMMING “REMOTE RESET” TEMP RANGE
NOTE: In units equipped with EPROM version A.02F.00,
a continuous load or unload signal is applied
when the LOAD or UNLOAD key is pressed and
released. If the unit is equipped with EPROM
version A.02F.01 or later, each time the LOAD
or UNLOAD key is pressed and released, the
output is a 0.2 second (Butterfly valves), 0.4 second (Globe/Cage valves) load or unload pulse.
This limits the valve position increase or decrease
to increments of 1% for each press of the key. If
the key is pressed and held, this output will occur every 2 seconds until the key is released.
LOAD – Press and release this key to apply a load signal to the hot water valve (HOT WATER UNIT) or steam
valve (steam-fed unit). If the system is running,
SYSTEM RUN – UNIT LOADING
is displayed. If the not running,
SERVICE KEYS
SYSTEM READY TO START – UNIT LOADING
is displayed. When the unit is fully loaded (HOT WATER
VALVE = 100%; steam-fed units steam valve position =
100%), SYSTEM RUN – UNIT LOADED or
SYSTEM READY TO START – UNIT LOADED is displayed. The
unit will continue to load until the UNLOAD, HOLD, or
AUTO (returns to automatic leaving water temp control)
key is pressed. The LOAD key is also used in PROGRAM mode to program the maximum allowed LOADING. A special access code is required. Refer to “Service” manual, Form 155.16-M3 “Special Programming
Features”.
SERVICE KEYS
UNIT SWITCH
28342A(D)
FIG. 11 – KEYPAD – SERVICE KEYS LOCATION
UNLOAD – Press and release this key to apply an unload signal to the hot water valve (HOT WATER UNITS)
or steam valve (steam-fed unit). If the system is running,
SYSTEM RUN – UNIT UNLOADING
To enter DATA LOGGER setpoint:
is displayed. If the
system is not running,
SYSTEM READY TO START – UNIT UNLOADING
Refer to Form 155.16-NO1.2 for operation of this key.
The Service keys are provided to allow the service technician or operator to have manual control of certain unit
functions. Some keys also provide additional information that is helpful in system troubleshooting. LOAD,
UNLOAD, HOLD, and AUTO keys are enabled in SERVICE mode only. The DISPLAY DATA and HISTORY
PRINT keys, and certain WARNING RESET functions,
are enabled in LOCAL, SERVICE, or REMOTE modes.
98
is displayed. When the unit is fully unloaded (HOT WATER VALVE POSITION = 0% steam-fed units steam
valve position = 0%), SYSTEM RUN – UNIT UNLOADED or
SYSTEM READY TO START – UNIT UNLOADED is displayed.
The unit will continue to unload until the LOAD, HOLD,
or AUTO (returns unit to automatic leaving water temp
control) key is pressed.
HOLD – Press and release this key to hold the load
signal to the hot water valve or steam valve (steam-fed
unit) at its present position. If the system is running,
YORK INTERNATIONAL
FORM 155.16-O3
SYSTEM RUN – UNIT HOLDING
is displayed. If the system is not running,
SYSTEM READY TO START – UNIT HOLDING
is displayed. The unit will continue holding until the HOLD,
UNLOAD, or AUTO (returns unit to automatic, leaving
water temp control) key is pressed.
AUTO – Press and release this key to place the unit in
automatic leaving water temperature control. Load and
unload signals are applied to the hot water valve or steam
valve (steam-fed units) automatically as required to control the leaving water temperature to the desired LEAVING WATER TEMP setpoint.
SYSTEM RUN – AUTO TEMP CONTROL
is displayed. When
the Control Center is in LOCAL, REMOTE, or PROGRAM operating mode, the unit is automatically placed
in AUTO mode.
This key is also used to perform the auto calibration of
the steam or hot water valve position feedback potentiometer. This operation should be performed only by a
qualified service technician. A special access code is
required. The service technician should refer to the calibration procedure in the “Service” manual, Form 155.16M3.
OTHER SERVICE KEYS
WARNING RESET – This key is used (in any operating mode) to turn off the audible alarm that is turned on
by the occurrence of any of the following warning conditions. This key is also used (in SERVICE mode) to clear
the warning message (after the condition that caused
the alarm has reached the Reset threshold). Refer to
description of warning messages in “Display Messages”
section.
WARNING – Low Refrigerant Temperature
WARNING – High Gen Pressure Override
MANUAL PUMP – This key is used to (1) perform a
manual dilution cycle, (2) control the individual system
pumps, (3) enable or disable the automatic operation of
the refrigerant solenoids (4) control the stabilizer refrigerant solenoid valve (when in MANUAL control).
IMPORTANT!
Functions (3) and (4) should only be performed by a
qualified service technician. Instructions are in Control
Center “Service” manual, Form 155.16-M3 under “Special Setpoints and Programming Procedures”.
To manually control the system pumps or initiate a
manual dilution cycle, proceed as follows:
a. PURGE PUMP – The purge pump can be manually operated in LOCAL, REMOTE or SERVICE
mode. If it is desired to operate it in LOCAL or
REMOTE mode, place Control Center in the SERVICE mode, press and release the DISPLAY
HOLD key, then proceed to Step b. If it is desired
to operate it in SERVICE mode, then proceed to
Step b. The “Display Hold” feature is automatically
engaged when using the PUMP STATUS key in
SERVICE mode. It will remain engaged until the
DISPLAY HOLD key is pressed or 10 minutes have
elapsed, whichever occurs first.
ALL OTHER PUMPS, MANUAL DILUTION CYCLE and
STABILIZER REFRIGERANT SOLENOID VALVE,
place Control Center in SERVICE mode. The “Display
Hold” feature is automatically engaged when using the
PUMP STATUS key in SERVICE mode. It will remain
engaged until the DISPLAY HOLD key is pressed or 10
minutes have elapsed, whichever occurs first.
b. Press and hold the PUMP STATUS key until the
desired function is displayed. Immediately release
the key. The functions will scroll in this order:
PURGE PUMP – OFF
1
REFRIGERANT PUMP – OFF
2, 6
SOLUTION PUMP – OFF
2, 4
WARNING – High Hot Water Supply Temp1
WARNING – Ent Cond Water Temp High Limit
WARNING – Faulty Strong Soln Temp Sensor
WARNING – Purge Pump Service Recommended
CHILLED WATER PUMP – OFF
2
CONDENSER WATER PUMP – OFF
2
ABSORBER PUMP – OFF
2, 4
GENERATOR PUMP – OFF
2, 4
WARNING – Purge Pump Overloads Open
WARNING – Replace RTC, U16 – Reprogram Setpoints
NOTE: 1. Hot water units only (Micro Board program
jumper JP1 is “OUT”)
YORK INTERNATIONAL
MANUAL DILUTION CYCLE – OFF
3
STABILIZER REF SOLENOID VALVE – CLOSED
5
99
c. Press and release the MANUAL PUMP key. The
displayed message will change from
< FUNCTION > – OFF
< FUNCTION > – ON
to
or vice versa.
If selected function cannot be turned on or off, a
message(s) giving the reason(s) will scroll on the display until the MANUAL PUMP key is released. Refer to
“Manual Pump Operation Fault Messages” in “Display
Messages” section.
NOTES:
1. The purge pump can be operated in LOCAL, REMOTE or SERVICE mode. It will operate if the unit is
running or not running. It will turn off only when manually turned off.
CAUTION: TO REDUCE THE RISK OF INJURY, DO
NOT OPERATE THE PUMP WITH THE BELT GUARD
REMOVED!
2. This pump can be manually operated if (a) the Control Center is in SERVICE mode and (b) the UNIT
switch is in STOP/RESET and (c) no dilution cycle is
in progress. (If the unit is equipped with Franklin
pumps, the refrigerant, solution and generator pumps
are not allowed to run if the motor coolant float switch
(2F) is open.) Anytime the pump is turned on, it will
remain on until (a) it is manually turned off or (b) 2
hours have elapsed or (c) the UNIT switch is moved
from STOP/RESET position to RUN position.
3. A manual dilution cycle can be initiated only if the
following conditions are satisfied:
(A). the Control Center is in SERVICE mode
(B). the UNIT SWITCH is in STOP/RESET position
(C). the unit is not presently performing a dilution
cycle
(D). the refrigerant level float switch is closed
(E). the refrigerant temperature is greater than 34°F
(F). the solution (absorber and generator pumps on
50 Hz Models YIA-10E3 – YIA-14F3 with Franklin pumps) and refrigerant pump overloads or
thermal switches are closed
(G). the low refrigerant temperature cutout switch
(LRT) is not tripped
When the dilution cycle is manually initiated, it will automatically terminate when the cycle is complete. It can
be stopped at any time during the cycle by pressing the
MANUAL PUMP key.
4. 50 Hz Models YIA-10E3 – YIA-14F3 equipped with
100
Franklin pumps, have an absorber pump and a generator pump in place of the solution pump.
5. The stabilizer refrigerant solenoid valve can be manually operated in SERVICE mode only if “Manual Solenoid Control” is selected using a special procedure
found in “Service” manual, Form 155.16-M3. This
should only be performed by a qualified service technician. If manual control is selected, the valve will not
respond to any automatic control, unless the “Automatic Decrystallization Routine” becomes active.
When the “Automatic Decrystallization Routine” becomes active, the valve reverts to AUTOMATIC control for as long as the “Automatic Decrystallization
Routine” is active; then reverts to MANUAL control if
manual control is still selected. Upon exit from SERVICE mode, the valve automatically reverts to AUTOMATIC mode.
6. If the unit is equipped with Buffalo pumps (EPROM
version A.02F.02 or later; Micro Board program
jumper JP2 in), manual operation of the Refrigerant
pump is inhibited until refrigerant level float switches
1F and 3F are closed.
DISPLAY DATA – Press and hold this key. The messages below will scroll sequentially on the display until
the key is released. Each will be displayed for 2 seconds. Or, to hold each of these messages, press and
release the DISPLAY HOLD key, then press and release
the DISPLAY DATA key. Each time the DISPLAY DATA
key is pressed, the next message is displayed. To terminate, press DISPLAY HOLD key again.
The DISPLAY DATA key is used to manually control the
Refrigerant Level Solenoid Valve (referred to as Refrigerant Level Unloader Solenoid Valve in EPROM version
A.02F.01 or earlier) when “Manual Solenoid Control” has
been selected with the MANUAL PUMP key. Instructions for selection of Manual Solenoid Control are contained in the Control Center “Service” manual, Form
155.16-M3 under “Special Setpoints and Programming
Procedures” section. Manual Solenoid Control should
only be selected by a qualified technician.
EPROM version A.02F.01 and earlier:
STEAM VALVE POSITION = XXX%
1
HOT WATER VALVE POSITION = XXX%
1
GENERATOR SHELL PRESSURE = XX.XX%
AUTO DECRYSTALLIZATION TEMP = XXX.X°F
REFRIGERANT LEVEL FLOAT SWITCH – CLOSED
YORK INTERNATIONAL
FORM 155.16-O3
REF LEVEL UNLOADER SOLENOID – CLOSED
REMOTE LOAD LIMIT = XXX%
2
EPROM version A.02F.02 or later:
STEAM VALVE POSITION = XXX%
1
HOT WATER VALVE POSITION = XXX%
1
GENERATOR SHELL PRESSURE = XX.XX%
3. Displayed only when unit is equipped with EPROM
version A.02F.02 (or later) and Buffalo pumps (Micro
Board program jumper JP2 in).
4. Displayed only when unit is equipped with Franklin
pumps. If equipped with Franklin pumps and EPROM
version A.02F.02 or later, Micro Board program jumper
JP2 must be out.
AUTO DECRYSTALLIZATION TEMP = XXX.X°F
REFRIGERANT LEVEL FLOAT SWITCH (1F) – CLOSED
3
REFRIGERANT LEVEL FLOAT SWITCH (3F) – CLOSED
3
MOTOR COOLANT FLOAT SWITCH (2F) – CLOSED
4
REFRIGERANT LEVEL SOLENOID – CLOSED
REMOTE LOAD LIMIT = XXX%
• If unit is connected to FAX-4500 Energy Management System, the value displayed is the same as
above but is a result of input to Micro Board RS485 serial port TB-7 from FAX-4500. The steam or
hot water valve will be limited to this position during
system run.
HISTORY PRINT – Press and release this key to initiate a history print to an optional printer. The last four
safety and cycling shutdowns are stored in memory in a
last in, first out format. Details of the optional printers,
installation and operation instructions are in YORK Form
155.16-NO1.2.
2
If a printer is connected to the Micro Board,
NOTES:
1. The “Steam Valve Position” message is displayed for
steam units (Micro Board program jumper JP1 is in).
The “Hot Water Valve Position” message is displayed
for hot water units (Micro Board program jumper JP1
is out). This value represents the present position of
the steam or hot water valve. It is provided by the
valve feedback potentiometer. The range is 0-100%.
The minimum position during unit operation is factory
set by the valve actuator limit switch at 20% of unit
capacity.
2. Displayed only when Control Center is in REMOTE
mode as follows:
• Value displayed is 100% to (10-20% as programmed; the minimum allowable steam or hot
water valve position is factory set to 10%. It should
only be changed by an authorized service technician using YORK “Service” manual, Form 155.16M3). The steam or hot water valve will be limited to
this position during system run. This load limit value
is a result of a 1-11 second PWM input to the relay
board TB4-82. The PWM input could be directly from
an external energy management or from the optional card file mounted in the Control Center. The
card file accepts 4-20mA, 0-10VDC or discrete contact closure inputs. Refer to “Field Control Modifications Diagrams”, Form 155.16-PA1 for details.
– or –
YORK INTERNATIONAL
INVALID HISTORY DATA WILL NOT BE PRINTED
is momentarily displayed when this key is pressed, and a history
of the last four safety or cycling shutdowns and a system parameters that were valid at the time the shutdown
occurred are printed. If a history print is already in
progress,
HISTORY PRINT REQUEST IN PROGRESS . . .
is displayed.
If a printer is not connected to the Micro Board, the number of safety or cycling shutdowns (up to four) stored in
memory and a description of each is displayed on the
keypad display as follows:
X SAFETY SHUTDOWN(S) RECORDED IN HISTORY
is displayed for 2 seconds and then
HISTORY # 1 – SHUTDOWN ON: MON, DAY, YEAR is displayed.
The “Display Hold” feature is automatically invoked. Press
and release the “Advance Day/Scroll” key to view the
cause of History #1 shutdown. If it had been caused by
a solution pump overload, for example,
TUES 7:06 AM SOLUTION PUMP OVERLOADS OPEN
is displayed. If there was more than one shutdown stored
in memory, pressing the ADVANCE DAY/SCROLL key
displays
HISTORY #2 – SHUTDOWN ON: MON, DAY, YEAR . Pressing
the ADVANCE DAY/SCROLL key again, displays the
reason for History #2 shutdown as above. Each time the
ADVANCE DAY/SCROLL key is pressed, the next shutdown and cause is displayed until the last shutdown is
displayed. When the last shutdown is displayed, the next
press of the ADVANCE DAY/SCROLL key causes the
101
normal background message to be displayed. Pressing
the CANCEL key exits the HISTORY display.
3. Using the Entry keys, enter “9 6 7 5”.
4. As each digit is entered, the characters Y O R K are
displayed.
OPERATING MODES
NOTE: If digits other than 9 6 7 5 are entered, Y O R K
is still displayed.
The Millennium Control Center can be operated in four
different operating modes as follows:
SERVICE – Enables all the Service keys except DISPLAY DATA and HISTORY PRINT, which are enabled
in all modes. See “Service Keys”, page 21.
LOCAL – This is the normal operating mode. The unit
can be started and stopped from the Control Center.
Also, the Display and Setpoints parameters, can be
displayed.
5. Press ENTER key.
NOTE: If digits other than 9 6 7 5 were entered in step
No. 4, INVALID ACCESS CODE
is displayed when the ENTER key is pressed. If
this occurs, enter the correct access code (9675)
and proceed.
6.
ACCESS TO PROGRAM KEY AUTHORIZED
is displayed.
1. Remote Start
NOTE: Unless terminated by pressing the ACCESS
CODE key again, the operator will have access
to the PROGRAM key for 10 minutes. When 10
minutes have elapsed, access to PROGRAM key
will be automatically disabled and the operator
must return to step No 1 to gain access.
2. Remote Stop
7. Press PROGRAM key.
3. Remote Leaving Chilled Water Temp Setpoint
8.
REMOTE – In this mode, the Control Center will accept control signals from a remote device (i.e. Energy
Management System) or cycling inputs. The control signal inputs are:
4. Remote Load Limit Setpoint
PROGRAM MODE, SELECT SETPOINT
is displayed.
9. Press MODE key.
NOTE: The unit can be stopped by the unit switch, regardless of the operating mode. The switch must
be in RUN position to enable REMOTE mode.
The operator cannot locally start the unit using
the UNIT switch when in the REMOTE mode.
10. The mode that has been previously selected will be
displayed as follows:
LOCAL MODE SELECTED
– or –
To determine which operating mode the Control Center
is presently in, simply press the mode key.
REMOTE MODE SELECTED
– or –
If the Control Center is in LOCAL mode,
LOCAL OPERATING MODE IN EFFECT
is displayed.
If the Control Center is in REMOTE mode,
REMOTE OPERATING MODE IN EFFECT
is displayed.
If the Control Center is in SERVICE mode,
SERVICE OPERATING MODE IN EFFECT
is displayed.
To change operating mode, proceed as follows:
1. Press the ACCESS CODE key.
2.
102
ENTER VALID ACCESS CODE
is displayed.
LOCAL MODE SELECTED
11. Press the ADVANCE DAY key to scroll to desired
mode. Each time this key is pressed, a different mode
is displayed as above.
12. When the desired mode is displayed, press the ENTER key.
13.
PROGRAM MODE, SELECT SETPOINT
is displayed.
14. Press the ACCESS CODE key to exit the PROGRAM
mode and terminate access to the PROGRAM mode.
15. ACCESS TO PROGRAM MODE DISABLED
is displayed.
YORK INTERNATIONAL
FORM 155.16-O3
UNIT SWITCH
SYSTEM READY TO START – UNIT HOLDING
(See Fig. 11, page 98).
– or –
This rocker switch is used to locally operate the unit. It is
used to start, run and stop the unit. Also, it resets the
Control Center after a safety shutdown.
To START unit in LOCAL mode:
Move the UNIT switch from the STOP/RESET to
the START position. Switch will spring-return to
RUN position.
To STOP the unit:
Move switch from the RUN to the STOP/RESET
position.
To RESET Control Center:
Following a safety shutdown, the operator is required to reset the Control Center prior to restarting the system. Move switch from the RUN to the
STOP/RESET position.
SYSTEM READY TO START – UNIT LOADING
– or –
SYSTEM READY TO START – UNIT LOADED
– or –
SYSTEM READY TO START – UNIT UNLOADING
– or –
SYSTEM READY TO START – UNIT UNLOADED
Control Center is in SERVICE mode. The system will
start when a start signal is applied. It is in the process of
holding, loading, or unloading or is in the fully loaded or
unloaded position.
SYSTEM START SEQUENCE:
NOTE: The operator cannot start the unit (using this
switch) when the Control Center is in the REMOTE mode.
COOLING START INITIATED
The system has received a start signal but has not yet
achieved the run state.
DISPLAY MESSAGES
SYSTEM READY TO START:
SYSTEM READY TO START
System has no status message to report and will start
when a start signal is applied.
SYSTEM READY TO START – DILUTION
Same as above, but a dilution cycle is in progress.
SYSTEM READY TO START – PRESS STATUS
System will start when a start signal is applied. The operator is instructed to press the STATUS key to view a
status message.
SYSTEM READY TO START – DIL’N – PRESS STATUS
SYSTEM RUN:
(All steam/hot water valve loading limits (strong solution
temperature limit, automatic decrystallization limit, remote load limit, maximum load limit), when active, will
automatically be scrolled on the display one after another should two or more be in effect simultaneously.
For example, if the automatic decrystallization limiting is
in effect and the steam/hot water valve is at the pulldown
limit, the display will flash between the following two
messages so long as the two limits are in effect: SYSTEM RUN – AUTOMATIC DECRYSTALLIZATION, and
SYSTEM RUN – PULL DOWN LIMIT.)
SYSTEM RUN – PRESS STATUS
The system is running in LOCAL, REMOTE or SERVICE mode. The operator is instructed to press the STATUS key to display a status message.
Same as above, but dilution cycle is in progress.
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103
SYSTEM RUN – REMOTE LOAD LIMIT
System is running in REMOTE mode and the unit loading is being inhibited by the remote load limit command
from a remote device. The load limit value that is in effect can be viewed by pressing the DISPLAY DATA keypad key. One of the scrolled messages is “REMOTE LOAD
LIMIT = XXX%”. The steam or hot water valve position will
be limited to this value during SYSTEM RUN.
The remote load limit command is input to the relay board
TB4-82 as a 1-11 second PWM signal directly from an
external energy management system or from the optional card file inside the Control Center that accepts 420mA, 0-10VDC or contact closure inputs (refer to YORK
Form 155.16-PA1). The load limit command can also be
input to the Micro Board RS-485 serial port TB7 from
the YORK FAX-4500 Energy Management System.
The load limit value is 100% to (10-20% as programmed;
the minimum allowable valve position is programmable
from 10% to 20%). The minimum allowable steam or hot
water valve position is factory set to 10%. It should only
be changed by a qualified service technician using YORK
“Service” manual, Form 155.16-M3.
SYSTEM RUN – LEAVING CHILLED WATER CONTROL
The system is running in LOCAL or REMOTE mode.
The loading and unloading is being automatically controlled by the LEAVING CHILLED WATER TEMP
setpoint. There are no status messages.
SYSTEM RUN – PULL DOWN LIMIT
The system is running in LOCAL, REMOTE or SERVICE mode. The loading is being inhibited by the programmed PULL DOWN DEMAND setpoint.
SYSTEM RUN – MAXIMUM COOLING
The system is running in LOCAL, REMOTE or SERVICE operating mode and the steam or hot water valve
position has reached and is being limited to the “Max
Allowed Loading” setpoint value that has been programmed by the service technician. During unit commissioning, it is sometimes necessary to temporarily limit
the load to some value less than 100% because of local
or unit conditions. Details of programming this function
are included in the Control Center “Service” manual,
Form 155.16-M3 and should only be performed by a
qualified service technician.
SYSTEM RUN – AUTOMATIC DECRYSTALLIZATION
If the system is running and the Automatic Decrystallization Cycle (ADC) temperature increases to 160°F
(71.1°C), this message is displayed and the steam or
104
hot water valve position is limited to 50% for a minimum
of 10 minutes. Simultaneously, the stabilizer refrigerant
solenoid valve is energized for 2 minutes, transferring
refrigerant to the generator’s drain line and thus to the
shell side of the heat exchanger to dilute the solution.
After 10 minutes, if the ADC temperature falls to 150°F
(65.6°C), the cycle terminates; otherwise, the cycle repeats. The ADC operation will continue for at least 10
minutes regardless of a shutdown or subsequent restart.
Units equipped with Buffalo pumps (Micro Board program jumper JP2 in) and EPROM version A.02F.02 or
later: If the refrigerant pump is not running when the
ADC is initiated, or the refrigerant pump shuts down
during the ADC, the standard ADC as described above
is not performed. Instead, a LIMITED ADC is performed.
The LIMITED ADC has two phases: PRIMARY and SECONDARY. Refer to messages “SYSTEM RUN – PRIMARY
LIMITED AUTO-DECRYST” and “SYSTEM RUN – SECONDARY
LIMITED AUTO-DECRYST”.
SYSTEM RUN – PRIMARY LIMITED AUTO-DECRYST
(EPROM version A.02F.02 or later; applicable only to
units equipped with Buffalo pumps, Micro Board program
jumper JP2 in)
The unit is running and performing a “Primary Limited
Automatic Decrystallization Cycle”. This variation of the
standard automatic decrystallization cycle (ADC) is performed if the refrigerant pump is not running when a
standard ADC is initiated or is turned-off during a
standard ADC. LIMITED ADC have two phases: Primary
and Secondary (see below). The Primary Limited ADC
is the same as Standard ADC except it is performed for
10 minutes only and the stabilizer refrigerant solenoid
valve (2SOL) is not energized (opened) during the first
two minutes of the cycle, as would be done in a Standard ADC. If float switches 1F and 3F close to start the
refrigerant pump before the “Primary Limited ADC” terminates, a normal ADC is performed. Otherwise, when
10 minutes have elapsed and the “Primary Limited ADC”
terminates, normal chiller operation continues, unless
the ADC temperature (RT2) is > 150°F (65.6°C) when it
terminates, then the “Secondary Limited ADC” (see below) is initiated.
SYSTEM RUN – SECONDARY LMTD AUTO-DECRYST
(EPROM version A.02F.02 or later; applicable only to
units equipped with Buffalo pumps, Micro Board program
jumper JP2 in)
The unit is running and performing a “Secondary Limited Automatic Decrystallization Cycle”. The secondary
limited ADC is performed for 15 minutes. It is initiated at
the completion of a “Primary ADC” (see preceding) if
the ADC temperature is > 150°F (65.6°C) when the primary ADC terminates. While the “Secondary ADC” is in
YORK INTERNATIONAL
FORM 155.16-O3
effect, the stabilizer refrigerant solenoid valve (2SOL) is
not energized (opened) and the steam/hot water valve
is driven to the closed (0%) position. If float switches 1F
and 3F close to start the refrigerant pump before the
“Secondary Limited ADC” terminates, a standard ADC
is performed and the unit continues to run. Otherwise, a
safety shutdown is performed and
DAY-TIME-RFS-CHK FOR CRYSTALLIZATION
is displayed.
SYSTEM RUN – STRONG SOLUTION TEMP CONTROL
(EPROM version A.02F.00 only)
Displayed while the unit is running and the Strong Solution Temperature exceeds the limit that is established by
the refrigerant leaving the condenser (RTLC). Whenever
the RTLC is between 72°F and 117°F (22.2°C and
47.2°C), the Strong Solution Temperature is not allowed
to exceed the temperatures below:
RTLC
(°F) (°C)
72
97
104
117
MAXIMUM ALLOWED STRONG
SOLUTION TEMP
(°F)
(°C)
22.2
36.1
40.0
47.2
170
205
214
231
76.8
96.1
101.1
110.6
For RTLC temperatures between 72°F and 117°F, but
not listed in the table above, the Strong Solution Temperatures are interpolated as follows:
1. 72°F to 97°F: Strong Sol Temp Limit =
SYSTEM RUN – LOW ECDWT LIMIT IN EFFECT
(EPROM version A.02F.01 or later)
Displayed while the unit is running and unit loading is
being limited because the entering condenser water temperature is < 74°F (23.3°C). While this is in effect, the
maximum allowed steam/hot water valve position is determined by the valve profile as per the programmed
valve part number. (The YORK part number is entered
by a qualified service technician using procedure in
“Service” manual, Form 155.16-M3.) The valve profile
includes size, flow characteristics and linearity. This
feature is bypassed for the first 30 minutes of unit operation.
If unit is equipped with EPROM version A.02F.02 and
later, in addition to the entering condenser water temperature having to be < 74°F (23.3°C), Strong Solution
temperature must be > the programmed LOW ECDWT
SOLUTION TEMP OVERRIDE setpoint (165°F to 185°F)
in order for this load limit to be performed. Both these
conditions must exist for 10 continuous seconds before
the load limit is put in effect. The LOW ECDWT SOLUTION TEMP OVERRIDE setpoint must be programmed
by a qualified service technician using procedure in “Service” manual, Form 155.16-M3.
SYSTEM RUN – UNIT LOADING
– or –
SYSTEM RUN – UNIT LOADED
(1.4 x RTLC) + 69.2
– or –
2. 98°F to 104°F: Strong Sol Temp Limit =
(1.285 x RTLC) + 80.355
3. 105°F to 117°F: Strong Sol Temp Limit =
(1.307 x RTLC) + 78.072
As the Strong Solution Temperature rises, when it gets
within 2°F (1.1°C) of the limit, the steam or hot water
valve is inhibited from loading and is pulsed closed per
the table below until the Strong Solution Temperature is
4°F (2.2°C) below the limit. However, if the Leaving
Chilled Water Temperature is < the Leaving Chilled Water Temp Setpoint, the valve is closed in accordance with
the Temperature Control Routine.
SYSTEM RUN – UNIT UNLOADING
– or –
SYSTEM RUN – UNIT UNLOADED
The system is running in SERVICE mode. It is in the
process of loading or unloading due to the operator
pressing the LOAD or UNLOAD keys or because of
automatic control. Or it is in the fully loaded or unloaded
position.
SYSTEM RUN – UNIT UNLOADED
(EPROM version A.02F.01 or later)
VALVE
TYPE
PULSE
DURATION
INTERVAL
BETWEEN
PULSES
Rotary Valve
Bowl Valve
1 Second
2 Seconds
15 Seconds
60 Seconds
YORK INTERNATIONAL
The system is running in SERVICE mode. The steam/
hot water valve is in the fully closed position (0%) or <
the programmed “MAXIMUM ALLOWED UNLOAD
LIMIT” value.
105
SYSTEM RUN – UNIT HOLDING
The system is running in SERVICE mode. The load command is in the process of holding because the operator
has pressed the HOLD key. The load command is unchanging.
SWITCH, the thermal switch does not have to be reset,
it automatically recloses. The motor protector is located
in the power panel. The thermal switch is located inside
the motor (M1).
SUN 12:00 AM GEN PUMP OVERLOADS OPEN
SYSTEM RUN – AUTO TEMP CONTROL
The system is running in SERVICE mode. The loading
and unloading is being automatically controlled by the
LEAVING CHILLED WATER TEMP setpoint. It is presently not loading or unloading.
SYSTEM SHUTDOWN
SYSTEM SHUTDOWN – PRESS STATUS
The system is shut down due to a cycling or safety shutdown. Pressing the STATUS key displays the day, time
and cause of shutdown.
SYSTEM SHUTDOWN – DILUTION – PRESS STATUS
Same as above but a dilution cycle is presently in
progress.
SAFETY SHUTDOWNS
SUN 12:00 AM SOLUTION PUMP OVERLOADS OPEN
(All Units Except 50 Hz Models YIA-10E3 – YIA-14F3
with Franklin pumps)
Unit has shut down because the solution pump (M1)
motor protector (1OL) or motor thermal switch (MTH1)
has opened. To restart the unit, press UNIT switch to
STOP/RESET position, reset the MOTOR PROTECTOR
(if tripped), then press the UNIT switch to the START
position. If the shutdown was caused by the THERMAL
SWITCH, the thermal switch does not have to be reset,
it automatically recloses. The motor protector is located
in the power panel. The thermal switch is located inside
the motor (M1).
(50 Hz Models YIA-10E3 – YIA-14F3 with Franklin pumps
Only)
Unit has shut down because the generator pump (M4)
motor protect (4OL) or motor thermal switch (MTH4) has
opened. To restart the unit, press UNIT switch to the
STOP/RESET position, reset the MOTOR PROTECTOR
(if tripped), then press the UNIT switch to the START
position. If the shutdown was caused by the THERMAL
SWITCH, the thermal switch does not have to be reset,
it automatically recloses. The motor protector is located
in the power panel. The thermal switch is located inside
the motor (M4).
SUN 12:00 AM REFRIG PUMP OVERLOADS OPEN
Unit has shut down because the refrigerant pump (M2)
motor protector (2OL) or motor thermal switch (MTH2)
opened. To restart the unit, press UNIT switch to STOP/
RESET position, reset the MOTOR PROTECTOR (if
tripped), then press the UNIT switch to the START position. If the shutdown was caused by the THERMAL
SWITCH, the thermal switch does not have to be reset,
it automatically recloses. The motor protector is located
in the power panel. The thermal switch is located inside
the motor (M2).
SUN 12:00 AM GEN SHELL HIGH PRESS – DIG
(DIG = Digital Initiated Shutdown)
Unit has shut down because the generator high pressure safety device (HP1) has opened. It is calibrated to
open at 13.73 PSIA (94.7 kPa). It will automatically
reclose at 0.77 PSIA (5.3 kPa). To restart unit, press
UNIT switch to STOP/RESET position, then to START
position.
SUN 12:00 AM GEN SHELL HIGH PRESS – ANA
SUN 12:00 AM ABSORBER PUMP OVERLOADS OPEN
(50 Hz Models YIA-10E3 – YIA-14F3 with Franklin pumps
Only)
Unit has shut down because the absorber pump (M1)
motor protector (1OL) or motor thermal switch (MTH1)
opened. To restart the unit, press UNIT switch to STOP/
RESET position, reset the MOTOR PROTECTOR (if
tripped), then press the UNIT switch to the START position. If the shutdown was caused by the THERMAL
106
(ANA = Analog Initiated Shutdown)
Unit has shut down because the generator pressure, as
sensed by pressure transducer PT1 has increased to
15.00 PSIA (103.4 kPa). It will be allowed to restart when
pressure decreases to < 15.00 PSIA (103.4 kPa). To restart unit, press UNIT switch to STOP/RESET position,
then to START position.
This analog check acts as a backup check to the digital
check performed by safety device HP1. HP1 is a caliYORK INTERNATIONAL
FORM 155.16-O3
brated to trip 13.73 PSIA (94.7 kPa).
SUN 12:00 AM LOW REFRIGERANT TEMP – DIGITAL
Unit has shut down because the low refrigerant temperature safety device (LRT) has opened. It is calibrated
to open at 33°F (0.6 °C). It will automatically close at
37°F (2.7°C). To restart unit, press UNIT switch to STOP/
RESET position, then to START position.
SUN 12:00 AM LOW REFRIGERANT TEMP – ANALOG
Unit has shut down because the refrigerant temperature, as sensed by thermistor RT8 has decreased to 33°F
(0.6°C). When the temperature increases to 37°F (2.7°C),
the unit will be allowed to restart. To restart unit, press
UNIT switch to STOP/RESET position, then to START
position.
SUN 12:00 AM GEN SHELL HI TEMP – MAN RESET
Unit has shut down because the generator high temperature safety device (HT1) has opened. It is calibrated
to open at 330°F (165.6°C). It will close when manually
reset (if temp < 326°F, 163.3°C). To restart unit, press
UNIT switch to STOP/RESET position, manually reset
HT1, then press UNIT switch to START position.
power failure or interruption with the Control Center configured for “Manual Restart After Power Failure” (Micro
Board program jumper J50 is OUT). After power is restored, the unit can be restarted pressing the UNIT switch
to STOP/RESET position, then to START position.
SUN 12:00 AM CHILLED WATER FLOW SWITCH
The unit has shut down because the chilled water flow
switch (CHFLS) has opened while the unit was running
or did not close within 30 seconds of initiating a start.
This check is bypassed for the first 30 seconds of “Cooling Start Sequence Initiated”. To restart unit, press the
UNIT switch to STOP/RESET position, then to START
position.
SUN 12:00 AM HIGH STEAM SUPPLY TEMP
(Steam Units Only)
(EPROM version A.02F.00)
Unit has shut down because the steam supply temperature, as sensed by thermistor RT7, has increased to
285°F (140.1°C). It will be allowed to restart when temperature decreases to 284°F (140°C). To restart unit,
press UNIT switch to STOP/RESET position, then to
START position.
(EPROM version A.02F.01 or later)
SUN 12:00 AM GEN SHELL HI TEMP – ANA
(ANA = Analog Initiated Shutdown)
Unit has shut down because the generator strong solution temperature, as sensed by thermistor RT3, has increased to 337°F (169.4°C). It will be allowed to restart
when temperature decreases to 336°F (168.9°C). To restart unit, press UNIT switch to STOP/RESET position,
then to START position.
This analog check acts as a backup check to the digital
check performed by safety device HT1. HT1 is a calibrated to trip 330°F (165.6°C).
SUN 12:00 AM AUXILIARY SAFETY SHUTDOWN
Unit has shut down because an external device connected to digital input board TB1-31 has initiated a shutdown. This input is a general purpose input that can be
used to annunciate a user-defined safety shutdown. Typical application is normally open contacts that close to
apply 115VAC to TB-31 to initiate a shutdown. The unit
will be allowed to restart when the contacts open. To
restart unit, press UNIT switch to STOP/RESET position, then to START position.
The unit has shut down because the steam supply temperature, as sensed by thermistor RT7, has increased
to the shutdown threshold. The actual shutdown threshold is determined by the position of Micro Board program jumper JP5. The unit design determines the appropriate position of this jumper: Standard temperature
units require the jumper to be in, high temperature units
(equipped with additional tube supports) require the
jumper be removed. This jumper must never be changed
by anyone but a qualified service technician. The unit
can be restarted when the temperature decreases to
the reset threshold. To restart the unit, press UNIT switch
to STOP/RESET position, then to START position. The
thresholds are as follows:
JP5 – IN – Standard units,
Shutdown threshold = 290.0°F (143.3°C)
Reset threshold
= 289.0°F (142.8°C)
OUT – High temperature units,
Shutdown threshold = 340.0°F (171.1°C)
Reset threshold
= 339.0°F (170.1°C)
SUN 12:00 AM HIGH HOT WATER SUPPLY TEMP
(Hot Water Units Only)
SUN 12:00 AM POWER FAILURE – MANUAL RESTART
The chiller has shut down because there has been a
YORK INTERNATIONAL
(EPROM version A.02F.00)
Unit has shut down because the hot water supply tem107
perature, as sensed by thermistor RT7, has increased
to 260°F (126.7°C). It will be allowed to restart when
temperature decreases to 259°F (126.1°C). To restart
unit, press UNIT switch to STOP/RESET position, then
to START position.
(EPROM version A.02F.01 or later)
The unit has shutdown because the hot water supply
temperature, as sensed by thermistor RT7, has increased to the shutdown threshold. The actual shutdown
threshold is determined by the position of Micro Board
program jumper JP5. The unit design determines the
appropriate position of this jumper: Standard temperature units require the jumper to be in, high temperature
units (equipped with additional tube supports) require
the jumper be removed. This jumper must never be
changed by anyone but a qualified service technician.
The unit can be restarted when the temperature decreases to the reset threshold. To restart the unit, press
UNIT switch to STOP/RESET position, then to START
position. The thresholds are as follows:
a. the refrigerant pump was started at unit start or,
b.
restarted after the pump was shutdown due to
low refrigerant level.
The “Refrigerant Float Switch Shutdown” timer (20 to 60
minutes) is a setpoint that determines the number of
minutes the unit is permitted to run without the refrigerant pump running. The timer is started when the unit
enters SYSTEM RUN and at the instant the refrigerant
pump is shut down due to low refrigerant level. Since
the refrigerant pump is started only after float switches
1F and 3F close, indicating sufficient refrigerant level at
the pump input, and the pump was shutdown for an excessive amount of time, this shutdown indicates the possibility that either 1F or 3F has failed to close.
The “Refrigerant Float Switch Shutdown” setpoint timer
can only be programmed by a qualified service technician using procedure in MicroComputer Control Center
“Service” manual, Form 155.16-M3.
To restart unit, press UNIT switch to STOP/RESET position, then to START position.
JP5 – IN – Standard units,
Shutdown threshold = 255.0°F (123.9°C)
Reset threshold
= 254.0°F (123.3°C)
OUT – High temperature units,
Shutdown threshold = 270.0°F (132.2°C)
Reset threshold
= 269.0°F (131.7°C)
SUN 12:00 AM MOTOR COOLANT LEVEL FLOAT SW
(Applicable only to units equipped with Franklin pumps;
Micro Board program jumper JP2 OUT)
The unit has shut down because the refrigerant and solution* pumps motor coolant level float switch (2F) has
opened indicating a low coolant level. The unit can be
restarted when the float switch has closed. To restart
unit, press the UNIT switch to STOP/RESET position,
then to START position.
*On 50 Hz Models YIA-10E3 – YIA-14F3, the solution
pump is replaced by two pumps; an absorber pump and
a generator pump.
SUN 12:00 AM REFRIGERANT PUMP FLOAT SW FAILURE
(EPROM version A.02F.02 or later; applicable only to
units equipped with Buffalo pumps, Micro Board program
jumper JP2 IN)
The unit has shut down because the REFRIGERANT
FLOAT SWITCH SHUTDOWN setpoint timer elapsed
before:
108
SUN 12:00 AM REF PUMP FLOAT SW CONFLICT
(EPROM version A.02F.02 or later; applicable only to
units equipped with Buffalo pumps, Micro Board program
jumper JP2 IN)
The unit has shut down because float switches 1F and
3F are in conflicting positions. Since float switches 1F
and 3F are used to detect if there is sufficient refrigerant
level at the refrigerant pump input, it is important that a
failed or stuck float switch is detected. Therefore, to assure both float switches are operational, the program
compares the state of 1F to 3F. To illustrate, as the refrigerant level rises against the float, it causes the switch
to close. When the level decreases below the float, the
switch opens. Since 1F is at a higher level than 3F, it is
not possible 3F would be open if 1F is closed; unless
one of the switches is stuck in one position.
NOTE: The state of each float switch is not recognized
as being valid until it has been in the same state
for the duration of the respective float switch timer.
1F is determined by REFRIGERANT PUMP
START-UP DELAY setpoint timer. 3F is determined by REFRIGERANT PUMP SHUTDOWN
DELAY setpoint timer. Therefore, the float switch
conflict will be allowed to exist for the duration of
the respective timer, depending upon which float
switch is causing the conflict.
The unit will be allowed to restart after the float switch
conflict has been resolved. To restart unit, press UNIT
switch to STOP/RESET position, then to START position.
YORK INTERNATIONAL
FORM 155.16-O3
SUN 12:00 AM RFS-CHK FOR CRYSTALLIZATION
(RFS = Refrigerant Float Switch)
(EPROM version A.02F.02 or later; applicable only to
units equipped with Buffalo pumps, Micro Board program
jumper JP2 IN)
Unit has shut down because a “Secondary Limited AutoDecrystallization Cycle” was performed and completed
without the refrigerant pump running. This safety shutdown is performed at the end of the secondary limited
auto-decrystallization cycle if the refrigerant pump had
not been started.
Refer to explanation of message “SYSTEM RUN – SECONDARY LMTD AUTO-DECRYST” for explanation of secondary limited auto-decrystallization cycle.
After it has been determined that crystallization has not
occurred, the unit can be restarted. To restart unit, press
UNIT switch to STOP/RESET position, then to START
position.
SUN 12:00 AM – PO – CHK FOR CRYSTALLIZATION
(PO = Pump Overload)
This message indicates the unit is prevented from starting because the Strong Solution Temperature (as measured by Thermistor RT3), decreased to <136°F (57.7°C)
before the solution(*) or refrigerant pump overload or
thermal switch reclosed during a solution or refrigerant
pump overload safety shutdown.
A dilution cycle is not initiated on “Pump Overload” safety
shutdowns until the overload or thermal switch recloses.
However, if the strong solution temperature has decreased to < 136°F (57.7°C) before this happens, a dilution cycle is not initiated because crystallization might
have occurred during the shutdown. This message advised the operator to check for crystallization prior to
starting the unit.
After it has been determined that crystallization has not
occurred, the unit can be restarted. To restart unit, press
UNIT switch to STOP/RESET position, then press the
WARNING RESET key in SERVICE mode and then initiate a start.
(*) on 50 Hz Models YIA-10E3 – YIA-14F3 with Franklin
pumps, the solution pump is replaced by two pumps; an
absorber pump and a generator pump.
SUN 12:00 AM – FLS – CHK FOR CRYSTALLIZATION
(FLS = Chilled Water Flow Switch)
This message indicates the unit is prevented from start-
YORK INTERNATIONAL
ing because the Strong Solution Temperature (as measured by Thermistor RT3), decreased to <136°F (57.7°C)
before the Chilled Water Flow Switch (CHFLS) reclosed
during a “Chilled Water Flow Switch” safety shutdown.
A dilution cycle is not initiated on a “Chilled Water Flow
Switch” shutdown until the flow switch recloses. However,
if the Strong Solution Temperature has decreased to
<136°F (57.7°C) before this happens, a dilution cycle is
not initiated because crystallization might have occurred
during the shutdown. This message advised the operator
to check for crystallization prior to starting the unit.
After it has been determined that crystallization has not
occurred during the shutdown, the unit can be restarted.
To restart unit, press UNIT switch to STOP/RESET position, then press the WARNING RESET key in SERVICE mode, and then initiate a start.
SUN 12:00 AM – CDFL – CHK FOR CRYSTALLIZATION
(CDFL = Condenser Water Flow Switch)
This message indicates the unit is prevented from starting because the Strong Solution Temperature (as measured by Thermistor RT3), decreased to <136°F (57.7°C)
while the Condenser Water Flow Switch was open during a “Condenser Water Flow Switch Shutdown”.
This message advised the operator to check for crystallization prior to starting the unit.
After it has been determined that crystallization has not
occurred during the shutdown, the unit can be restarted.
To restart unit, press UNIT switch to STOP/RESET position, then press the WARNING RESET key in SERVICE mode, and then initiate a start.
SUN 12:00 AM – LRT– CHK FOR CRYSTALLIZATION
(LRT = Low Refrigerant Temperature)
This message indicates the unit is prevented from starting because the Strong Solution Temperature (as measured by Thermistor RT3), decreased to <136°F (57.7°C)
before a dilution cycle could be performed while the unit
is shutdown on a “Low Refrigerant Temperature” safety
shutdown.
A dilution cycle is not initiated on a “Low Refrigerant
Temp” safety shutdowns until the refrigerant temperature (as sensed by Thermistor RT8), increases to 37°F
(2.7°C). However, if the Strong Solution Temperature has
decreased to <136°F (57.7°C) before this happens, a
dilution cycle is not initiated because crystallization might
have occurred during the shutdown. This message advises the operator to check for crystallization prior to
starting the unit.
109
After it has been determined that crystallization has not
occurred during the shutdown, the unit can be restarted.
To restart unit, press UNIT switch to STOP/RESET position, then press the WARNING RESET key in SERVICE mode, and then initiate a start.
SUN 12:00 AM HIGH STEAM SUPPLY PRESSURE
(Steam Units Only; not applicable to units equipped with
EPROM version A.02F.02 or later) )
Unit has shut down because the steam supply pressure,
as sensed by Transducer PT2, has increased to 29.0
PSIA (199.9 kPa). The unit will be allowed to restart when
pressure decreases to 28.9 PSIA (199.2 kPa). To restart
unit, press the UNIT switch to STOP/RESET position,
then to START position.
SUN 12:00 AM – MCFL – CHK FOR CRYSTALLIZATION
power failure, and the Strong Solution Temperature has
decreased to <136°F (57.7°C) during the power failure,
crystallization might have occurred. This message is advising the operator to check for crystallization prior to
starting the unit. After it has been determined that crystallization has not occurred, the unit can be started. To
start unit, press UNIT switch to STOP/RESET position,
press WARNING RESET key in SERVICE mode, then
initiate a start.
CYCLING SHUTDOWNS
SUN 12:00 AM COND FLOW SWITCH – AUTO START
Condenser flow switch has opened for 30 consecutive
seconds while unit was running or did not close within
30 seconds of the condenser water pump starting at unit
start. The unit will automatically restart when the flow
switch closes.
(Units equipped with Franklin pumps only)
(MCFL = Motor Coolant Float Switch)
This message indicates the unit is prevented from starting because the Strong Solution Temperature (as measured by Thermistor RT3) decreased to < 136°F (57.7°C)
before the Motor Coolant Float Switch reclosed during a
“Motor Coolant Switch” safety shutdown.
A dilution cycle is not initiated on “Motor Coolant Float
Switch” safety shutdowns until the float switch recloses.
However, if the Strong Solution Temperature has decreased to < 136°F (57.7°C) before the switch closes, a
dilution cycle is not initiated because crystallization might
have occurred during the shutdown. This message advises the operator to check for crystallization prior to
starting the unit.
After it has been determined that crystallization has not
occurred during the shutdown, the unit can be restarted.
To restart unit, press UNIT switch to STOP/RESET position, then press WARNING RESET key in SERVICE
mode and then initiate a start.
SUN 12:00 AM – PF – CHK FOR CRYSTALLIZATION
(PF = Power Failure)
This message indicates the unit is prevented from starting because a power failure interrupted a dilution cycle
or prevented a dilution cycle from being initiated and
when power was restored, the Strong Solution Temperature (as measured by Thermistor RT3) was >136°F
(57.7°C).
Since a dilution cycle cannot be performed during a
110
SUN 12:00 AM POWER FAILURE – AUTO START
A power failure has occurred with the Control Center
operating in “Auto-Restart After Power Failure Mode”
(Micro Board program jumper J50 in IN). If the unit is
running when the power failure occurs, it will automatically restart when power is restored.
SUN 12:00 AM LOW WATER TEMP – AUTO START
The leaving chilled water temperature has decreased to
2°F (0.5°C) below the LEAVING CHILLED WATER
TEMP set-point. The unit will automatically restart when
the water temperature increases to 2°F (0.5°C) above
the setpoint. If the setpoint is increased while the unit is
running, the shutdown threshold is the previous threshold for 30 minutes to eliminate nuisance trips.
SUN 12:00 AM LVG WATER TEMP < SETPOINT
The unit is shut down for any reason other than
SUN 12:00 AM LOW WATER TEMP – AUTO START and the leaving chilled water temperature is less than the LEAVING
CHILLED WATER TEMP setpoint. It will be allowed to
start when the water temperature is equal to or greater
than the setpoint. If a start signal is applied while shutdown with this condition, the unit will automatically start
when the condition clears.
NOTE: This check is not performed if the unit has shut
down on
SUN 12:00 AM LOW WATER TEMP – AUTO START . If
YORK INTERNATIONAL
FORM 155.16-O3
the unit has shut down on “Low Water Temp”,
then the criterion for that restart applies.
SUN 12:00 AM SYSTEM CYCLING – AUTO START
A remote device (Energy Management System, time
clock, etc.) connected to the REMOTE/LOCAL cycling
input (TB2- 1 and 13 ) of the digital input board has
shut down the unit. Relay contacts or switch connected
from 1 to 13 will cycle unit in LOCAL or REMOTE
mode. When the contacts are closed, the unit runs. When
the contacts open, the unit shuts down.
SUN 12:00 AM HW VALVE LOADED ABOVE 10%
(Hot Water Fed Unit Only)
The unit is shut down for any reason and the hot water
valve is at a position that is greater than or equal to 10%
position. Hot water fed units (Micro Board program
jumper JP1 is OUT) are not allowed to start until the hot
water valve position is <10%.
SUN 12:00 AM STEAM VALVE LOADED ABOVE 10%
DILUTION CYCLE INTERRUPTION
MESSAGES
DILUTION INTERRUPTED – REF LEVEL SW
Displayed when the refrigerant level float switch opens
during a dilution cycle. The opening of this switch during
a dilution cycle terminates the dilution cycle.
DILUTION INTERRUPTED – CH WATER FLOW SW
Displayed when the chilled water flow switch opens during a dilution cycle. The opening of the flow switch during a dilution cycle, terminates the dilution cycle. If the
flow switch recloses, another 6-minute dilution cycle is
initiated.
DILUTION INTERRUPTED – COND WATER FLOW SW
Displayed when the condenser water flow switch opens
during a dilution cycle. The opening of the flow switch
during a dilution cycle, terminates the dilution cycle. If
the flow switch recloses, another 6-minute dilution cycle
is initiated.
(Steam Fed Unit Only)
The unit is shut down for any reason and the steam valve
is at a position that is greater than or equal to 10%. Steam
fed units (Micro Board program jumper JP1 is IN) are
not allowed to start until the steam valve position is <10%.
SUN 12:00 AM MULTI-UNIT CYCLING – AUTO START
A remote device (Energy Management System, time
clock, multi-unit sequencer, etc.) connected to the
MULTI-UNIT cycling input (TB2- 1 and 9 ) of the
digital input board has shut down the unit. Relay contacts or switch connected from 1 to 9 will cycle unit
in LOCAL or REMOTE mode. When the contacts are
closed, the unit runs. When the contacts open, the unit
shuts down.
SUN 12:00 AM INTERNAL CLOCK – AUTO START
The operator-programmed daily stop schedule (DAILY
SCHEDULE setpoint) has shut down unit. The unit will
automatically restart when the operator-programmed
daily start schedule initiates a start. It can be overridden
by pressing the UNIT switch to START position.
WARNING MESSAGES
Coincident with the occurrence of each of the following
warning conditions, K7 relay contacts (relay output board
TB4-89 & 90) close to sound an external audible alarm
(supplied by others). The alarm is silenced by pressing
the WARNING RESET key in any operating mode. After the alarm has been silenced, the warning message
will be displayed until the condition that caused the alarm
reaches the reset threshold and the WARNING RESET
key is pressed in SERVICE mode. This clears the WARNING message. If the condition that caused the warning
reaches the reset threshold, the alarm and warning
message are automatically cleared when entering SYSTEM RUN upon starting the unit.
If multiple warning conditions exist, the appropriate
“Warning Messages” will scroll on the display while the
STATUS key is being pressed. Each warning message
will be displayed for 2 seconds and will scroll from the
most recent to the oldest occurrence.
WARNING – LOW REFRIGERANT TEMPERATURE
Indicates the refrigerant temperature decreased to
35.5°F (1.9°C). The unit will be inhibited from further loading (the load signal will be allowed to decrease or remain at its present level, but will not be allowed to in-
YORK INTERNATIONAL
111
crease) until the refrigerant temperature increases to
36.0°F (2.2°C). The reset threshold is 36.0°F (2.2°C).
WARNING – HIGH STEAM SUPPLY PRESSURE
(Steam Units Only)
WARNING – HIGH GEN PRESSURE OVERRIDE
Indicates the generator pressure increased to 10.0 PSIA
(68.9 kPa). The steam valve (steam units) or hot water
valve (hot water units) will be driven to 30% position until
the pressure decreases to 6.0 PSIA (41.4 kPa). It will
then be allowed to load. The reset threshold is 6.0 PSIA
(41.4 kPa).
The steam valve or hot water valve limit switch is factory
set to prevent the valve from unloading to less than 20%
of unit capacity. Therefore, although the valve is being
commanded to unload to 30% position, the limit switch
may prevent it from actually reaching 30% valve position.
WARNING – ENTERING COND WATER TEMP HIGH LIMIT
Indicates the Entering Condenser Water Temperature
has exceeded the programmed limit for at least 10 continuous minutes following a 30 minute bypass at unit start.
The limit is programmable from 75° to 125°F (23.9° to
51.7°C). After this criteria has been met, and while the
threshold is exceeded, the steam valve (steam units) or
hot water valve (hot water units) position is limited to
60%. When the entering condenser water temperature
falls below the threshold, the unit will be allowed to load
above 60% steam valve/hot water valve position. The
reset threshold is 0.1°F (0.1°C) below the programmed
value.
Instructions for programming this threshold are contained
in the “Service” manual, Form 155.16-M3 under “Special Programming Procedures”. This value is programmed at the YORK factory and should not be arbitrarily changed.
Displayed when the steam supply pressure (as sensed
by Transducer PT2), is greater than 26.0 PSIA (179.3
kPa). When the pressure decreases to less than 25.5
PSIA (175.8 kPa), the warning message is automatically
cleared and the alarm is automatically silenced.
WARNING – HIGH HOT WATER SUPPLY TEMP
(Hot Water Units Only)
(EPROM version A.02F.00)
Displayed when the hot water supply temperature (as
sensed by Thermistor RT7), has increased to greater
than 250°F (121.1°C). When the temperature decreases
to less than 249.5°F (120.8°C), the warning message is
automatically cleared and the alarm is automatically
cleared and the alarm is automatically silenced.
(EPROM version A.02F.01 or later)
Displayed when the hot water supply temperature (as
sensed by thermistor RT7) has increased to > the warning threshold, the warning message is automatically
cleared and the alarm is automatically silenced. The
actual shutdown threshold is determined by the position
of the Micro Board program jumper JP5. The unit design
determines the appropriate position of this jumper: “Standard temperature units” require the jumper to be “IN”,
“High temperature units” (equipped with additional tube
supports) require the jumper be removed. This jumper
must never be changed by anyone other than a qualified
service technician. The thresholds are as follows:
JP5 – IN – Standard units,
Warning threshold = 250.0°F (121.1°C)
Reset threshold
= 249.5°F (120.8°C)
OUT – High temperature units,
WARNING – PURGE PUMP OVERLOADS OPEN
Indicates the Purge Pump Overload Contacts (3OL) have
opened. The message can be cleared after the overload
has been manually reset.
Warning threshold = 266.0°F (130°C)
Reset threshold
= 265.5°F (129.7°C)
WARNING – HIGH STEAM SUPPLY TEMPERATURE
WARNING – FAULTY STRONG SOLN TEMP SENSOR
Displayed when the Strong Solution Temperature Sensor (RT3) has indicated the Strong Solution Temperature is less than or equal to 91°F (32.8°C) continuously
for 1 minute, after 30 minutes of unit run time. This is
indicative of a defective sensor RT3 or Micro Board. The
reset threshold is any value greater than 91°F (32.8°C).
112
(Steam Units Only)
(EPROM version A.02F.00)
Displayed when the steam supply temperature (as measured by thermistor RT7) has increased to > 280.0°F
(137.8°C). When the temperature decreases to
< 279.0°F (137.2°C), the warning message is automatically cleared and the alarm is automatically silenced.
YORK INTERNATIONAL
FORM 155.16-O3
(EPROM version A.02F.01 and later)
Displayed when the steam supply temperature (as
sensed by thermistor RT7) has increased to > the warning threshold, the warning message is automatically
cleared and the alarm is automatically silenced. The
actual shutdown threshold is determined by the position
of Micro Board program jumper JP5. The unit design
determines the appropriate position of this jumper: “Standard temperature units” require the jumper to be “IN”,
“High temperature units” (equipped with additional tube
supports) require the jumper be removed. This jumper
must never be changed by anyone other than a qualified
service technician. The thresholds are as follows:
JP5 – IN – Standard units,
Warning threshold = 285.0°F (140.6°C)
Reset threshold
= 284.0°F (140°C)
OUT – High temperature units,
Warning threshold = 337.0°F (169.4°C)
Reset threshold
= 336.0°F (168.9°C)
WARNING – PURGE PUMP SERVICE RECOMMENDED
Displayed when the purge pump operating hours are
equal to or greater than the programmed “Purge Pump
Service Interval”. After servicing the pump, pressing the
WARNING RESET key in SERVICE mode clears the
message and resets the counter.
REPLACE RTC, U16 – REPROGRAM SETPOINTS
Indicates that the battery located inside the REAL TIME
CLOCK IC Chip (U16 on the Micro Board) is defective.
This battery provides backup power to the RTC memory
(RAM) in the event of a utility AC power failure. This assures that system setpoints will be maintained. If this
message appears, the RTC IC Chip (U16 on the Micro
Board) must be replaced. If there is a power failure while
this message is displayed, the setpoints will be lost and
must be reprogrammed.
The messages that can be displayed are as follows:
SOLUTION PUMP MOTOR OVERLOADS OPEN
(Not on 50 Hz Models YIA-10E3 – YIA-14F3 with Franklin pumps)
Indicates the solution pump is prevented from starting
because solution pump motor overload (1OL) or thermal switch (MTH1) is open. The overload must be manually reset; the thermal switch automatically resets when
the temperature decreases.
ABSORBER PUMP MOTOR OVERLOADS OPEN
(50 Hz Models YIA-10E3 – YIA-14F3 with Franklin
pumps)
Indicates the absorber pump is prevented from starting
because the absorber pump overload (1OL) or thermal
switch (MTH1) is open. The overload must be manually
reset; the thermal switch automatically resets when the
temperature decreases.
GENERATOR PUMP MOTOR OVERLOADS OPEN
(50 Hz Models YIA-10E3 – YIA-14F3 with Franklin
pumps)
Indicates the generator pump is prevented from starting
because the generator pump overload (4OL) or thermal
switch (MTH4) is open. The overload must be manually
reset; the thermal switch automatically resets when the
temperature decreases.
REFRIGERANT PUMP MOTOR OVERLOADS OPEN
Indicates the refrigerant pump is prevented from starting because the refrigerant pump overload (2OL) or thermal switch (MTH2) is open. The overload must be manually reset; the thermal switch automatically resets when
the temperature decreases.
REFRIGERANT LEVEL FLOAT SWITCH FAULTED
MANUAL PUMP OPERATION FAULT
MESSAGES
Anytime an operator or service technician attempts to
manually operate a system pump, and there is a
condition(s) preventing the pump from starting or stopping, that condition(s) is displayed when the MANUAL
PUMP key is pressed. If more than one condition is preventing the pump from operating, the messages will scroll
on the display until the MANUAL PUMP key is released.
YORK INTERNATIONAL
Indicates a manual dilution cycle is inhibited because
the Refrigerant Level Float Switch (1F) is open indicating a low refrigerant level.
MOTOR COOLANT FLOAT SWITCH OPEN
(Units equipped with Franklin pumps only)
Indicates a manual dilution cycle is inhibited because
the refrigerant and solution (absorber and generator
113
pumps on 50 Hz Models YIA-10E3 – YIA-14F3) Pumps
Motor Coolant Float Switch (2F) is open.
REFRIGERANT TEMP BELOW ACCEPTABLE LIMITS
Indicates the solution pump is prevented from starting
or a manual dilution cycle is inhibited because the refrigerant temperature (as measured by Thermistor RT8)
is less than or equal to 34°F (1.1°C).
UNIT SWITCH NOT IN STOP/RESET POSITION
Indicates the selected system pump (except purge) cannot be started or a manual dilution cycle cannot be initiated because the UNIT switch is not in the STOP/RESET position.
DILUTION CYCLE CURRENTLY IN PROGRESS
Indicates a manual dilution cycle cannot be performed
or the selected pump cannot be operated because a
dilution cycle is in progress.
MANUAL OPERATION IN SERVICE MODE ONLY
Indicates a selected system pump (except purge pump)
cannot be started or a manual dilution cycle cannot be
initiated because the Control Center is in LOCAL or
REMOTE operating mode. System pumps (except purge)
can be manually operated in SERVICE mode only and
manual dilution cycles can be initiated in SERVICE mode
only.
AUTOMATIC SOLENOID CONTROL ACTIVE
Indicates the Stabilizer Refrigerant Solenoid Valve
(2SOL) or Refrigerant Level Solenoid Valve (3SOL) cannot be manually controlled because “Automatic Solenoid
Control” has been selected. These solenoid Valves can
be manually controlled only when “Manual Solenoid
Control” is selected. Instructions for selecting the desired
control mode are contained in the IsoFlow Control Center “Service” manual, Form 155.16-M3 in “Special Programming Procedures” section. This selection should be
performed by a qualified service technician only.
PURGE PUMP OVERLOADS OPEN
Indicates the purge pump is prevented from starting
because the purge pump overload (3OL) is open. The
overload must be manually reset.
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YORK INTERNATIONAL
FORM 155.16-O3
NOTES
YORK INTERNATIONAL
115
NOTES
116
YORK INTERNATIONAL
Proud Sponsor
of the 1998
U.S. Olympic Team
36USC380
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Copyright © by York International Corporation 1997
Form 155.16-O3 (797)
Supersedes: 155.16-O3 (894)
Subject to change without notice. Printed in USA
ALL RIGHTS RESERVED